81163922 has 32 divisors (see below), whose sum is σ = 141557760. Its totient is φ = 34186320.

The previous prime is 81163913. The next prime is 81163931. The reversal of 81163922 is 22936118.

It is an interprime number because it is at equal distance from previous prime (81163913) and next prime (81163931).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339479 + ... + 339717.

It is an arithmetic number, because the mean of its divisors is an integer number (4423680).

Almost surely, 2^81163922 is an apocalyptic number.

81163922 is a deficient number, since it is larger than the sum of its proper divisors (60393838).

81163922 is a wasteful number, since it uses less digits than its factorization.

81163922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its digits is 5184, while the sum is 32.

The square root of 81163922 is about 9009.1021750228. The cubic root of 81163922 is about 432.9665465641.

The spelling of 81163922 in words is "eighty-one million, one hundred sixty-three thousand, nine hundred twenty-two".