313121121 has 16 divisors (see below), whose sum is σ = 451348800. Its totient is φ = 192414528.

The previous prime is 313121119. The next prime is 313121143. The reversal of 313121121 is 121121313.

It is a happy number.

It is not a de Polignac number, because 313121121 - 2¹ = 313121119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313121121.

It is not an unprimeable number, because it can be changed into a prime (313121101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72126 + ... + 76343.

It is an arithmetic number, because the mean of its divisors is an integer number (28209300).

Almost surely, 2^313121121 is an apocalyptic number.

It is an amenable number.

313121121 is a deficient number, since it is larger than the sum of its proper divisors (138227679).

313121121 is a wasteful number, since it uses less digits than its factorization.

313121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148528.

The product of its digits is 36, while the sum is 15.

The square root of 313121121 is about 17695.2287637092. The cubic root of 313121121 is about 679.0537017499.

Adding to 313121121 its reverse (121121313), we get a palindrome (434242434).

The spelling of 313121121 in words is "three hundred thirteen million, one hundred twenty-one thousand, one hundred twenty-one".