81512104 has 16 divisors (see below), whose sum is σ = 155341620. Its totient is φ = 40087680.

The previous prime is 81512009. The next prime is 81512117. The reversal of 81512104 is 40121518.

It can be written as a sum of positive squares in 2 ways, for example, as 81036004 + 476100 = 9002^2 + 690^2 .

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, 83029 + ... + 84004.

Almost surely, 2^81512104 is an apocalyptic number.

It is an amenable number.

81512104 is a deficient number, since it is larger than the sum of its proper divisors (73829516).

81512104 is a wasteful number, since it uses less digits than its factorization.

81512104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167100 (or 167096 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 81512104 is about 9028.4053963034. The cubic root of 81512104 is about 433.5847855529.

The spelling of 81512104 in words is "eighty-one million, five hundred twelve thousand, one hundred four".