81156958 has 8 divisors (see below), whose sum is σ = 124704720. Its totient is φ = 39588720.

The previous prime is 81156941. The next prime is 81156983. The reversal of 81156958 is 85965118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494778 + ... + 494941.

It is an arithmetic number, because the mean of its divisors is an integer number (15588090).

Almost surely, 2^81156958 is an apocalyptic number.

81156958 is a deficient number, since it is larger than the sum of its proper divisors (43547762).

81156958 is a wasteful number, since it uses less digits than its factorization.

81156958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989762.

The product of its digits is 86400, while the sum is 43.

The square root of 81156958 is about 9008.7156687288. The cubic root of 81156958 is about 432.9541631258.

The spelling of 81156958 in words is "eighty-one million, one hundred fifty-six thousand, nine hundred fifty-eight".