81321932 has 12 divisors (see below), whose sum is σ = 142989336. Its totient is φ = 40467840.

The previous prime is 81321913. The next prime is 81321941. The reversal of 81321932 is 23912318.

It is a super-2 number, since 2×81321932² = 13226513248425248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81321895 and 81321904.

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, 47333 + ... + 49020.

It is an arithmetic number, because the mean of its divisors is an integer number (11915778).

Almost surely, 2^81321932 is an apocalyptic number.

It is an amenable number.

81321932 is a deficient number, since it is larger than the sum of its proper divisors (61667404).

81321932 is a wasteful number, since it uses less digits than its factorization.

81321932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96568 (or 96566 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 81321932 is about 9017.8673753832. The cubic root of 81321932 is about 433.2473309930.

The spelling of 81321932 in words is "eighty-one million, three hundred twenty-one thousand, nine hundred thirty-two".