81535512 has 16 divisors (see below), whose sum is σ = 203838840. Its totient is φ = 27178496.

The previous prime is 81535469. The next prime is 81535577. The reversal of 81535512 is 21553518.

It is a self number, because there is not a number n which added to its sum of digits gives 81535512.

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, 1698633 + ... + 1698680.

Almost surely, 2^81535512 is an apocalyptic number.

It is an amenable number.

81535512 is an abundant number, since it is smaller than the sum of its proper divisors (122303328).

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

81535512 is a wasteful number, since it uses less digits than its factorization.

81535512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397322 (or 3397318 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 81535512 is about 9029.7016562011. The cubic root of 81535512 is about 433.6262860614.

The spelling of 81535512 in words is "eighty-one million, five hundred thirty-five thousand, five hundred twelve".