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BaseRepresentation
bin100101100010100101001
32022111102001
410230110221
5303330441
642211001
713312234
oct4542451
92274361
101230121
11770232
124b3a61
13340ba9
1424041b
15194731
hex12c529

1230121 has 4 divisors (see below), whose sum is σ = 1232644. Its totient is φ = 1227600.

The previous prime is 1230107. The next prime is 1230127. The reversal of 1230121 is 1210321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 354025 + 876096 = 595^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230121 - 27 = 1229993 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1230098 and 1230107.

It is not an unprimeable number, because it can be changed into a prime (1230127) 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, 270 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (308161).

21230121 is an apocalyptic number.

It is an amenable number.

1230121 is a deficient number, since it is larger than the sum of its proper divisors (2523).

1230121 is an equidigital number, since it uses as much as digits as its factorization.

1230121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1230121 is about 1109.1082003123. The cubic root of 1230121 is about 107.1476402521.

Adding to 1230121 its reverse (1210321), we get a palindrome (2440442).

The spelling of 1230121 in words is "one million, two hundred thirty thousand, one hundred twenty-one".

Divisors: 1 661 1861 1230121