81497512 has 16 divisors (see below), whose sum is σ = 157737600. Its totient is φ = 39434160.

The previous prime is 81497497. The next prime is 81497519. The reversal of 81497512 is 21579418.

It is not an unprimeable number, because it can be changed into a prime (81497519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164062 + ... + 164557.

It is an arithmetic number, because the mean of its divisors is an integer number (9858600).

Almost surely, 2^81497512 is an apocalyptic number.

It is an amenable number.

81497512 is a deficient number, since it is larger than the sum of its proper divisors (76240088).

81497512 is a wasteful number, since it uses less digits than its factorization.

81497512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328656 (or 328652 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 81497512 is about 9027.5972440068. The cubic root of 81497512 is about 433.5589110858.

The spelling of 81497512 in words is "eighty-one million, four hundred ninety-seven thousand, five hundred twelve".