81495274 has 16 divisors (see below), whose sum is σ = 142679808. Its totient is φ = 34183152.

The previous prime is 81495269. The next prime is 81495287. The reversal of 81495274 is 47259418.

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, 61269 + ... + 62584.

It is an arithmetic number, because the mean of its divisors is an integer number (8917488).

Almost surely, 2^81495274 is an apocalyptic number.

81495274 is a deficient number, since it is larger than the sum of its proper divisors (61184534).

81495274 is a wasteful number, since it uses less digits than its factorization.

81495274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123909.

The product of its digits is 80640, while the sum is 40.

The square root of 81495274 is about 9027.4732899079. The cubic root of 81495274 is about 433.5549424014.

The spelling of 81495274 in words is "eighty-one million, four hundred ninety-five thousand, two hundred seventy-four".