531915257 has 2 divisors, whose sum is σ = 531915258. Its totient is φ = 531915256.

The previous prime is 531915247. The next prime is 531915269. The reversal of 531915257 is 752519135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529966441 + 1948816 = 23021^2 + 1396^2 .

It is a cyclic number.

It is not a de Polignac number, because 531915257 - 2²⁰ = 530866681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531915257.

It is not a weakly prime, because it can be changed into another prime (531915217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265957628 + 265957629.

It is an arithmetic number, because the mean of its divisors is an integer number (265957629).

Almost surely, 2^531915257 is an apocalyptic number.

It is an amenable number.

531915257 is a deficient number, since it is larger than the sum of its proper divisors (1).

531915257 is an equidigital number, since it uses as much as digits as its factorization.

531915257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 38.

The square root of 531915257 is about 23063.2880786760. The cubic root of 531915257 is about 810.2408758800.

The spelling of 531915257 in words is "five hundred thirty-one million, nine hundred fifteen thousand, two hundred fifty-seven".