81174939 has 8 divisors (see below), whose sum is σ = 109757952. Its totient is φ = 53354280.

The previous prime is 81174937. The next prime is 81174941. The reversal of 81174939 is 93947118.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81174937) and next prime (81174941).

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

It is not a de Polignac number, because 81174939 - 2¹ = 81174937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81174939.

It is not an unprimeable number, because it can be changed into a prime (81174931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190339 + ... + 190764.

It is an arithmetic number, because the mean of its divisors is an integer number (13719744).

Almost surely, 2^81174939 is an apocalyptic number.

81174939 is a deficient number, since it is larger than the sum of its proper divisors (28583013).

81174939 is a wasteful number, since it uses less digits than its factorization.

81174939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381177.

The product of its digits is 54432, while the sum is 42.

The square root of 81174939 is about 9009.7135914523. The cubic root of 81174939 is about 432.9861356316.

The spelling of 81174939 in words is "eighty-one million, one hundred seventy-four thousand, nine hundred thirty-nine".