81522958 has 32 divisors (see below), whose sum is σ = 141886080. Its totient is φ = 34740000.

The previous prime is 81522923. The next prime is 81522989. The reversal of 81522958 is 85922518.

It is a self number, because there is not a number n which added to its sum of digits gives 81522958.

It is a congruent number.

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, 41253 + ... + 43183.

It is an arithmetic number, because the mean of its divisors is an integer number (4433940).

Almost surely, 2^81522958 is an apocalyptic number.

81522958 is a deficient number, since it is larger than the sum of its proper divisors (60363122).

81522958 is a wasteful number, since it uses less digits than its factorization.

81522958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064.

The product of its digits is 57600, while the sum is 40.

The square root of 81522958 is about 9029.0064791205. The cubic root of 81522958 is about 433.6040298130.

The spelling of 81522958 in words is "eighty-one million, five hundred twenty-two thousand, nine hundred fifty-eight".