81413912 has 16 divisors (see below), whose sum is σ = 156777360. Its totient is φ = 39606624.

The previous prime is 81413909. The next prime is 81413929. The reversal of 81413912 is 21931418.

It is a congruent number.

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, 137228 + ... + 137819.

It is an arithmetic number, because the mean of its divisors is an integer number (9798585).

Almost surely, 2^81413912 is an apocalyptic number.

It is an amenable number.

81413912 is a deficient number, since it is larger than the sum of its proper divisors (75363448).

81413912 is a wasteful number, since it uses less digits than its factorization.

81413912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275090 (or 275086 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 81413912 is about 9022.9658095329. The cubic root of 81413912 is about 433.4106123845.

The spelling of 81413912 in words is "eighty-one million, four hundred thirteen thousand, nine hundred twelve".