231891953 has 2 divisors, whose sum is σ = 231891954. Its totient is φ = 231891952.

The previous prime is 231891943. The next prime is 231892021. The reversal of 231891953 is 359198132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230675344 + 1216609 = 15188^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 231891953 - 2¹⁰ = 231890929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231891953.

It is not a weakly prime, because it can be changed into another prime (231891943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115945976 + 115945977.

It is an arithmetic number, because the mean of its divisors is an integer number (115945977).

Almost surely, 2^231891953 is an apocalyptic number.

It is an amenable number.

231891953 is a deficient number, since it is larger than the sum of its proper divisors (1).

231891953 is an equidigital number, since it uses as much as digits as its factorization.

231891953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 231891953 is about 15227.9989821381. The cubic root of 231891953 is about 614.3679610676.

The spelling of 231891953 in words is "two hundred thirty-one million, eight hundred ninety-one thousand, nine hundred fifty-three".