81795597 has 16 divisors (see below), whose sum is σ = 117653760. Its totient is φ = 50248512.

The previous prime is 81795509. The next prime is 81795601. The reversal of 81795597 is 79559718.

It is not a de Polignac number, because 81795597 - 2²⁴ = 65018381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81795997) 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, 26583 + ... + 29499.

It is an arithmetic number, because the mean of its divisors is an integer number (7353360).

Almost surely, 2^81795597 is an apocalyptic number.

It is an amenable number.

81795597 is a deficient number, since it is larger than the sum of its proper divisors (35858163).

81795597 is a wasteful number, since it uses less digits than its factorization.

81795597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652.

The product of its digits is 793800, while the sum is 51.

The square root of 81795597 is about 9044.0918283706. The cubic root of 81795597 is about 434.0868624230.

The spelling of 81795597 in words is "eighty-one million, seven hundred ninety-five thousand, five hundred ninety-seven".