81461012 has 12 divisors (see below), whose sum is σ = 144684960. Its totient is φ = 40122456.

The previous prime is 81460997. The next prime is 81461021. The reversal of 81461012 is 21016418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151712 + ... + 152247.

It is an arithmetic number, because the mean of its divisors is an integer number (12057080).

Almost surely, 2^81461012 is an apocalyptic number.

It is an amenable number.

81461012 is a deficient number, since it is larger than the sum of its proper divisors (63223948).

81461012 is a wasteful number, since it uses less digits than its factorization.

81461012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304030 (or 304028 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 81461012 is about 9025.5754387186. The cubic root of 81461012 is about 433.4941759263.

The spelling of 81461012 in words is "eighty-one million, four hundred sixty-one thousand, twelve".