81711932 has 24 divisors (see below), whose sum is σ = 153081600. Its totient is φ = 38047536.

The previous prime is 81711919. The next prime is 81711943. The reversal of 81711932 is 23911718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4628 + ... + 13595.

It is an arithmetic number, because the mean of its divisors is an integer number (6378400).

Almost surely, 2^81711932 is an apocalyptic number.

It is an amenable number.

81711932 is a deficient number, since it is larger than the sum of its proper divisors (71369668).

81711932 is a wasteful number, since it uses less digits than its factorization.

81711932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18305 (or 18303 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 81711932 is about 9039.4652496705. The cubic root of 81711932 is about 433.9388093560.

The spelling of 81711932 in words is "eighty-one million, seven hundred eleven thousand, nine hundred thirty-two".