81136955 has 8 divisors (see below), whose sum is σ = 97519632. Its totient is φ = 64806048.

The previous prime is 81136927. The next prime is 81136961. The reversal of 81136955 is 55963118.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81136955 is a prime.

It is a Duffinian 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, 9404 + ... + 15833.

It is an arithmetic number, because the mean of its divisors is an integer number (12189954).

Almost surely, 2^81136955 is an apocalyptic number.

81136955 is a deficient number, since it is larger than the sum of its proper divisors (16382677).

81136955 is a wasteful number, since it uses less digits than its factorization.

81136955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25885.

The product of its digits is 32400, while the sum is 38.

The square root of 81136955 is about 9007.6053976626. The cubic root of 81136955 is about 432.9185896972.

The spelling of 81136955 in words is "eighty-one million, one hundred thirty-six thousand, nine hundred fifty-five".