81926115 has 16 divisors (see below), whose sum is σ = 136781568. Its totient is φ = 41794016.

The previous prime is 81926113. The next prime is 81926153. The reversal of 81926115 is 51162918.

It is a cyclic number.

It is not a de Polignac number, because 81926115 - 2¹ = 81926113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81926113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118389 + ... + 119078.

It is an arithmetic number, because the mean of its divisors is an integer number (8548848).

Almost surely, 2^81926115 is an apocalyptic number.

81926115 is a deficient number, since it is larger than the sum of its proper divisors (54855453).

81926115 is a wasteful number, since it uses less digits than its factorization.

81926115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237498.

The product of its digits is 4320, while the sum is 33.

The square root of 81926115 is about 9051.3046021002. The cubic root of 81926115 is about 434.3176248080.

The spelling of 81926115 in words is "eighty-one million, nine hundred twenty-six thousand, one hundred fifteen".