81097164 has 36 divisors (see below), whose sum is σ = 205558080. Its totient is φ = 26958240.

The previous prime is 81097151. The next prime is 81097171. The reversal of 81097164 is 46179018.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11109 + ... + 16899.

Almost surely, 2^81097164 is an apocalyptic number.

It is an amenable number.

81097164 is an abundant number, since it is smaller than the sum of its proper divisors (124460916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81097164 is a wasteful number, since it uses less digits than its factorization.

81097164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190 (or 6185 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 81097164 is about 9005.3963821700. The cubic root of 81097164 is about 432.8478078100.

The spelling of 81097164 in words is "eighty-one million, ninety-seven thousand, one hundred sixty-four".