231257071817 has 2 divisors, whose sum is σ = 231257071818. Its totient is φ = 231257071816.

The previous prime is 231257071807. The next prime is 231257071841. The reversal of 231257071817 is 718170752132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222127460416 + 9129611401 = 471304^2 + 95549^2 .

It is a cyclic number.

It is not a de Polignac number, because 231257071817 - 2⁶ = 231257071753 is a prime.

It is not a weakly prime, because it can be changed into another prime (231257071807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115628535908 + 115628535909.

It is an arithmetic number, because the mean of its divisors is an integer number (115628535909).

Almost surely, 2^231257071817 is an apocalyptic number.

It is an amenable number.

231257071817 is a deficient number, since it is larger than the sum of its proper divisors (1).

231257071817 is an equidigital number, since it uses as much as digits as its factorization.

231257071817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 44.

The spelling of 231257071817 in words is "two hundred thirty-one billion, two hundred fifty-seven million, seventy-one thousand, eight hundred seventeen".