231985157 has 2 divisors, whose sum is σ = 231985158. Its totient is φ = 231985156.

The previous prime is 231985141. The next prime is 231985189. The reversal of 231985157 is 751589132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222337921 + 9647236 = 14911^2 + 3106^2 .

It is a cyclic number.

It is not a de Polignac number, because 231985157 - 2⁴ = 231985141 is a prime.

It is a super-2 number, since 2×231985157² = 107634226136629298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231985357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115992578 + 115992579.

It is an arithmetic number, because the mean of its divisors is an integer number (115992579).

Almost surely, 2^231985157 is an apocalyptic number.

It is an amenable number.

231985157 is a deficient number, since it is larger than the sum of its proper divisors (1).

231985157 is an equidigital number, since it uses as much as digits as its factorization.

231985157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 231985157 is about 15231.0589585885. The cubic root of 231985157 is about 614.4502607202.

The spelling of 231985157 in words is "two hundred thirty-one million, nine hundred eighty-five thousand, one hundred fifty-seven".