531391689 has 6 divisors (see below), whose sum is σ = 767565786. Its totient is φ = 354261120.

The previous prime is 531391687. The next prime is 531391691. The reversal of 531391689 is 986193135.

531391689 is a `hidden beast` number, since 531 + 39 + 1 + 6 + 89 = 666.

It is an interprime number because it is at equal distance from previous prime (531391687) and next prime (531391691).

It can be written as a sum of positive squares in only one way, i.e., 504766089 + 26625600 = 22467^2 + 5160^2 .

It is not a de Polignac number, because 531391689 - 2¹ = 531391687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531391687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29521752 + ... + 29521769.

It is an arithmetic number, because the mean of its divisors is an integer number (127927631).

Almost surely, 2^531391689 is an apocalyptic number.

It is an amenable number.

531391689 is a deficient number, since it is larger than the sum of its proper divisors (236174097).

531391689 is a wasteful number, since it uses less digits than its factorization.

531391689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59043527 (or 59043524 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 531391689 is about 23051.9346042800. The cubic root of 531391689 is about 809.9749466417.

The spelling of 531391689 in words is "five hundred thirty-one million, three hundred ninety-one thousand, six hundred eighty-nine".