531688687 has 2 divisors, whose sum is σ = 531688688. Its totient is φ = 531688686.

The previous prime is 531688669. The next prime is 531688709. The reversal of 531688687 is 786886135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531688687 - 2²³ = 523300079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531688637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265844343 + 265844344.

It is an arithmetic number, because the mean of its divisors is an integer number (265844344).

Almost surely, 2^531688687 is an apocalyptic number.

531688687 is a deficient number, since it is larger than the sum of its proper divisors (1).

531688687 is an equidigital number, since it uses as much as digits as its factorization.

531688687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 52.

The square root of 531688687 is about 23058.3756366315. The cubic root of 531688687 is about 810.1258184882.

The spelling of 531688687 in words is "five hundred thirty-one million, six hundred eighty-eight thousand, six hundred eighty-seven".