230931557 has 4 divisors (see below), whose sum is σ = 236564076. Its totient is φ = 225299040.

The previous prime is 230931511. The next prime is 230931577. The reversal of 230931557 is 755139032.

It is a happy number.

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 97436641 + 133494916 = 9871^2 + 11554^2 .

It is a cyclic number.

It is not a de Polignac number, because 230931557 - 2²⁰ = 229882981 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 (230931577) 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, 2816198 + ... + 2816279.

It is an arithmetic number, because the mean of its divisors is an integer number (59141019).

Almost surely, 2^230931557 is an apocalyptic number.

It is an amenable number.

230931557 is a deficient number, since it is larger than the sum of its proper divisors (5632519).

230931557 is an equidigital number, since it uses as much as digits as its factorization.

230931557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632518.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 230931557 is about 15196.4323773707. The cubic root of 230931557 is about 613.5186388400.

The spelling of 230931557 in words is "two hundred thirty million, nine hundred thirty-one thousand, five hundred fifty-seven".