81461592 has 32 divisors (see below), whose sum is σ = 226282800. Its totient is φ = 27153792.

The previous prime is 81461581. The next prime is 81461659. The reversal of 81461592 is 29516418.

81461592 is a `hidden beast` number, since 8 + 1 + 4 + 61 + 592 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188353 + ... + 188784.

Almost surely, 2^81461592 is an apocalyptic number.

It is an amenable number.

81461592 is an abundant number, since it is smaller than the sum of its proper divisors (144821208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81461592 is a wasteful number, since it uses less digits than its factorization.

81461592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377152 (or 377142 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81461592 is about 9025.6075695767. The cubic root of 81461592 is about 433.4952047457.

The spelling of 81461592 in words is "eighty-one million, four hundred sixty-one thousand, five hundred ninety-two".