231313121 has 4 divisors (see below), whose sum is σ = 249106452. Its totient is φ = 213519792.

The previous prime is 231313109. The next prime is 231313123. The reversal of 231313121 is 121313132.

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 14899600 + 216413521 = 3860^2 + 14711^2 .

It is a cyclic number.

It is not a de Polignac number, because 231313121 - 2⁶ = 231313057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231313121.

It is not an unprimeable number, because it can be changed into a prime (231313123) 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, 8896646 + ... + 8896671.

It is an arithmetic number, because the mean of its divisors is an integer number (62276613).

Almost surely, 2^231313121 is an apocalyptic number.

It is an amenable number.

231313121 is a deficient number, since it is larger than the sum of its proper divisors (17793331).

231313121 is a wasteful number, since it uses less digits than its factorization.

231313121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17793330.

The product of its digits is 108, while the sum is 17.

The square root of 231313121 is about 15208.9815898370. The cubic root of 231313121 is about 613.8563547935.

Adding to 231313121 its reverse (121313132), we get a palindrome (352626253).

The spelling of 231313121 in words is "two hundred thirty-one million, three hundred thirteen thousand, one hundred twenty-one".