81517936 has 10 divisors (see below), whose sum is σ = 157941032. Its totient is φ = 40758960.

The previous prime is 81517913. The next prime is 81517979. The reversal of 81517936 is 63971518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2547420 + ... + 2547451.

Almost surely, 2^81517936 is an apocalyptic number.

It is an amenable number.

81517936 is a deficient number, since it is larger than the sum of its proper divisors (76423096).

81517936 is a wasteful number, since it uses less digits than its factorization.

81517936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094879 (or 5094873 counting only the distinct ones).

The product of its digits is 45360, while the sum is 40.

The square root of 81517936 is about 9028.7283711495. The cubic root of 81517936 is about 433.5951259647.

The spelling of 81517936 in words is "eighty-one million, five hundred seventeen thousand, nine hundred thirty-six".