81451204 has 12 divisors (see below), whose sum is σ = 142605484. Its totient is φ = 40706784.

The previous prime is 81451193. The next prime is 81451213. The reversal of 81451204 is 40215418.

It can be written as a sum of positive squares in 2 ways, for example, as 54908100 + 26543104 = 7410^2 + 5152^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10474 + ... + 16510.

Almost surely, 2^81451204 is an apocalyptic number.

It is an amenable number.

81451204 is a deficient number, since it is larger than the sum of its proper divisors (61154280).

81451204 is a wasteful number, since it uses less digits than its factorization.

81451204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9414 (or 9412 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 81451204 is about 9025.0320775053. The cubic root of 81451204 is about 433.4767774947.

The spelling of 81451204 in words is "eighty-one million, four hundred fifty-one thousand, two hundred four".