81150512 has 30 divisors (see below), whose sum is σ = 159070548. Its totient is φ = 40105312.

The previous prime is 81150493. The next prime is 81150551. The reversal of 81150512 is 21505118.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182963 + ... + 183405.

Almost surely, 2^81150512 is an apocalyptic number.

It is an amenable number.

81150512 is a deficient number, since it is larger than the sum of its proper divisors (77920036).

81150512 is a wasteful number, since it uses less digits than its factorization.

81150512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 81150512 is about 9008.3578969755. The cubic root of 81150512 is about 432.9427001677.

The spelling of 81150512 in words is "eighty-one million, one hundred fifty thousand, five hundred twelve".