81596361 has 32 divisors (see below), whose sum is σ = 136147968. Its totient is φ = 42229440.

The previous prime is 81596353. The next prime is 81596377. The reversal of 81596361 is 16369518.

It is not a de Polignac number, because 81596361 - 2³ = 81596353 is a prime.

It is a super-2 number, since 2×81596361² = 13315932256884642, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81596161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85690 + ... + 86636.

It is an arithmetic number, because the mean of its divisors is an integer number (4254624).

Almost surely, 2^81596361 is an apocalyptic number.

It is an amenable number.

81596361 is a deficient number, since it is larger than the sum of its proper divisors (54551607).

81596361 is a wasteful number, since it uses less digits than its factorization.

81596361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341.

The product of its digits is 38880, while the sum is 39.

The square root of 81596361 is about 9033.0704082278. The cubic root of 81596361 is about 433.7341293155.

The spelling of 81596361 in words is "eighty-one million, five hundred ninety-six thousand, three hundred sixty-one".