531081660 has 48 divisors (see below), whose sum is σ = 1500944256. Its totient is φ = 140296512.

The previous prime is 531081659. The next prime is 531081679. The reversal of 531081660 is 66180135.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34942 + ... + 47781.

It is an arithmetic number, because the mean of its divisors is an integer number (31269672).

Almost surely, 2^531081660 is an apocalyptic number.

It is an amenable number.

531081660 is an abundant number, since it is smaller than the sum of its proper divisors (969862596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531081660 is a wasteful number, since it uses less digits than its factorization.

531081660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82842 (or 82840 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 531081660 is about 23045.2090465676. The cubic root of 531081660 is about 809.8173952034.

The spelling of 531081660 in words is "five hundred thirty-one million, eighty-one thousand, six hundred sixty".