231897563 has 2 divisors, whose sum is σ = 231897564. Its totient is φ = 231897562.

The previous prime is 231897557. The next prime is 231897613. The reversal of 231897563 is 365798132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231897563 - 2⁶ = 231897499 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (231897503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115948781 + 115948782.

It is an arithmetic number, because the mean of its divisors is an integer number (115948782).

Almost surely, 2^231897563 is an apocalyptic number.

231897563 is a deficient number, since it is larger than the sum of its proper divisors (1).

231897563 is an equidigital number, since it uses as much as digits as its factorization.

231897563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 231897563 is about 15228.1831811940. The cubic root of 231897563 is about 614.3729153526.

The spelling of 231897563 in words is "two hundred thirty-one million, eight hundred ninety-seven thousand, five hundred sixty-three".