81030532 has 12 divisors (see below), whose sum is σ = 154694736. Its totient is φ = 36832040.

The previous prime is 81030503. The next prime is 81030557. The reversal of 81030532 is 23503018.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920758 + ... + 920845.

It is an arithmetic number, because the mean of its divisors is an integer number (12891228).

Almost surely, 2^81030532 is an apocalyptic number.

It is an amenable number.

81030532 is a deficient number, since it is larger than the sum of its proper divisors (73664204).

81030532 is a wasteful number, since it uses less digits than its factorization.

81030532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841618 (or 1841616 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 81030532 is about 9001.6960624096. The cubic root of 81030532 is about 432.7292281691.

The spelling of 81030532 in words is "eighty-one million, thirty thousand, five hundred thirty-two".