531861506 has 16 divisors (see below), whose sum is σ = 870704640. Its totient is φ = 241648080.

The previous prime is 531861493. The next prime is 531861557. The reversal of 531861506 is 605168135.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67295 + ... + 74781.

It is an arithmetic number, because the mean of its divisors is an integer number (54419040).

Almost surely, 2^531861506 is an apocalyptic number.

531861506 is a deficient number, since it is larger than the sum of its proper divisors (338843134).

531861506 is a wasteful number, since it uses less digits than its factorization.

531861506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10729.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 531861506 is about 23062.1227557222. The cubic root of 531861506 is about 810.2135828580.

The spelling of 531861506 in words is "five hundred thirty-one million, eight hundred sixty-one thousand, five hundred six".