81913022 has 16 divisors (see below), whose sum is σ = 126854640. Its totient is φ = 39645312.

The previous prime is 81913003. The next prime is 81913033. The reversal of 81913022 is 22031918.

It is a junction number, because it is equal to n+sod(n) for n = 81912982 and 81913000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5504 + ... + 13932.

It is an arithmetic number, because the mean of its divisors is an integer number (7928415).

Almost surely, 2^81913022 is an apocalyptic number.

81913022 is a deficient number, since it is larger than the sum of its proper divisors (44941618).

81913022 is a wasteful number, since it uses less digits than its factorization.

81913022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8587.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 81913022 is about 9050.5813072973. The cubic root of 81913022 is about 434.2944867906.

The spelling of 81913022 in words is "eighty-one million, nine hundred thirteen thousand, twenty-two".