81117274 has 16 divisors (see below), whose sum is σ = 145104768. Its totient is φ = 33252912.

The previous prime is 81117269. The next prime is 81117293. The reversal of 81117274 is 47271118.

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, 125637 + ... + 126280.

It is an arithmetic number, because the mean of its divisors is an integer number (9069048).

Almost surely, 2^81117274 is an apocalyptic number.

81117274 is a deficient number, since it is larger than the sum of its proper divisors (63987494).

81117274 is a wasteful number, since it uses less digits than its factorization.

81117274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251949.

The product of its digits is 3136, while the sum is 31.

The square root of 81117274 is about 9006.5128656989. The cubic root of 81117274 is about 432.8835832083.

The spelling of 81117274 in words is "eighty-one million, one hundred seventeen thousand, two hundred seventy-four".