81925562 has 16 divisors (see below), whose sum is σ = 125215200. Its totient is φ = 40190640.

The previous prime is 81925561. The next prime is 81925577. The reversal of 81925562 is 26552918.

It is not an unprimeable number, because it can be changed into a prime (81925561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79889 + ... + 80907.

It is an arithmetic number, because the mean of its divisors is an integer number (7825950).

Almost surely, 2^81925562 is an apocalyptic number.

81925562 is a deficient number, since it is larger than the sum of its proper divisors (43289638).

81925562 is a wasteful number, since it uses less digits than its factorization.

81925562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741.

The product of its digits is 43200, while the sum is 38.

The square root of 81925562 is about 9051.2740539661. The cubic root of 81925562 is about 434.3166475934.

The spelling of 81925562 in words is "eighty-one million, nine hundred twenty-five thousand, five hundred sixty-two".