231632257 has 2 divisors, whose sum is σ = 231632258. Its totient is φ = 231632256.

The previous prime is 231632243. The next prime is 231632263. The reversal of 231632257 is 752236132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146918641 + 84713616 = 12121^2 + 9204^2 .

It is a cyclic number.

It is not a de Polignac number, because 231632257 - 2¹⁹ = 231107969 is a prime.

It is not a weakly prime, because it can be changed into another prime (231632227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115816128 + 115816129.

It is an arithmetic number, because the mean of its divisors is an integer number (115816129).

Almost surely, 2^231632257 is an apocalyptic number.

It is an amenable number.

231632257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231632257 is an equidigital number, since it uses as much as digits as its factorization.

231632257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 31.

The square root of 231632257 is about 15219.4696688157. The cubic root of 231632257 is about 614.1385316621.

Adding to 231632257 its reverse (752236132), we get a palindrome (983868389).

The spelling of 231632257 in words is "two hundred thirty-one million, six hundred thirty-two thousand, two hundred fifty-seven".