231132257 has 2 divisors, whose sum is σ = 231132258. Its totient is φ = 231132256.

The previous prime is 231132217. The next prime is 231132259. The reversal of 231132257 is 752231132.

231132257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189090001 + 42042256 = 13751^2 + 6484^2 .

It is a cyclic number.

It is not a de Polignac number, because 231132257 - 2¹⁰ = 231131233 is a prime.

Together with 231132259, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12701474 and since 231132257 and 12701474 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (231132259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115566128 + 115566129.

It is an arithmetic number, because the mean of its divisors is an integer number (115566129).

Almost surely, 2^231132257 is an apocalyptic number.

It is an amenable number.

231132257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231132257 is an equidigital number, since it uses as much as digits as its factorization.

231132257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 231132257 is about 15203.0344668425. The cubic root of 231132257 is about 613.6963214088.

Adding to 231132257 its reverse (752231132), we get a palindrome (983363389).

The spelling of 231132257 in words is "two hundred thirty-one million, one hundred thirty-two thousand, two hundred fifty-seven".