231553117 has 4 divisors (see below), whose sum is σ = 237200796. Its totient is φ = 225905440.

The previous prime is 231553109. The next prime is 231553123. The reversal of 231553117 is 711355132.

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 87216921 + 144336196 = 9339^2 + 12014^2 .

It is a cyclic number.

It is not a de Polignac number, because 231553117 - 2³ = 231553109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231553717) 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, 2823778 + ... + 2823859.

It is an arithmetic number, because the mean of its divisors is an integer number (59300199).

Almost surely, 2^231553117 is an apocalyptic number.

It is an amenable number.

231553117 is a deficient number, since it is larger than the sum of its proper divisors (5647679).

231553117 is an equidigital number, since it uses as much as digits as its factorization.

231553117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647678.

The product of its digits is 3150, while the sum is 28.

The square root of 231553117 is about 15216.8694875129. The cubic root of 231553117 is about 614.0685810425.

The spelling of 231553117 in words is "two hundred thirty-one million, five hundred fifty-three thousand, one hundred seventeen".