Search a number
-
+
2013121031 = 5441369991
BaseRepresentation
bin111011111111101…
…1100101000000111
312012022001010220012
41313333130220013
513110324333111
6531432100435
7100613150345
oct16777345007
95168033805
102013121031
11943399699
1248223471b
132610bc69c
14151512995
15bbb0548b
hex77fdca07

2013121031 has 4 divisors (see below), whose sum is σ = 2013496464. Its totient is φ = 2012745600.

The previous prime is 2013121013. The next prime is 2013121037. The reversal of 2013121031 is 1301213102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2013121031 - 210 = 2013120007 is a prime.

It is a super-2 number, since 2×20131210312 = 8105312570909005922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2013120997 and 2013121015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013121037) 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, 179555 + ... + 190436.

It is an arithmetic number, because the mean of its divisors is an integer number (503374116).

Almost surely, 22013121031 is an apocalyptic number.

2013121031 is a deficient number, since it is larger than the sum of its proper divisors (375433).

2013121031 is an equidigital number, since it uses as much as digits as its factorization.

2013121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375432.

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

The square root of 2013121031 is about 44867.8173193214. The cubic root of 2013121031 is about 1262.6702903453.

Adding to 2013121031 its reverse (1301213102), we get a palindrome (3314334133).

The spelling of 2013121031 in words is "two billion, thirteen million, one hundred twenty-one thousand, thirty-one".

Divisors: 1 5441 369991 2013121031