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313012121 = 617507313
BaseRepresentation
bin10010101010000…
…010111110011001
3210210222122220112
4102222002332121
51120112341441
651020534105
710520362532
oct2252027631
9723878815
10313012121
11150761704
12889b1335
134cb05696
142d7dd689
151c72e4eb
hex12a82f99

313012121 has 4 divisors (see below), whose sum is σ = 313520052. Its totient is φ = 312504192.

The previous prime is 313012097. The next prime is 313012127. The reversal of 313012121 is 121210313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121210313 = 717315759.

It can be written as a sum of positive squares in 2 ways, for example, as 100902025 + 212110096 = 10045^2 + 14564^2 .

It is a cyclic number.

It is not a de Polignac number, because 313012121 - 214 = 312995737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313012096 and 313012105.

It is not an unprimeable number, because it can be changed into a prime (313012127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253040 + ... + 254273.

It is an arithmetic number, because the mean of its divisors is an integer number (78380013).

Almost surely, 2313012121 is an apocalyptic number.

It is an amenable number.

313012121 is a deficient number, since it is larger than the sum of its proper divisors (507931).

313012121 is an equidigital number, since it uses as much as digits as its factorization.

313012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507930.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 313012121 is about 17692.1485693513. The cubic root of 313012121 is about 678.9748979060.

Adding to 313012121 its reverse (121210313), we get a palindrome (434222434).

It can be divided in two parts, 3130 and 12121, that added together give a palindrome (15251).

The spelling of 313012121 in words is "three hundred thirteen million, twelve thousand, one hundred twenty-one".

Divisors: 1 617 507313 313012121