81337529 has 16 divisors (see below), whose sum is σ = 101525760. Its totient is φ = 63443520.

The previous prime is 81337523. The next prime is 81337559. The reversal of 81337529 is 92573318.

It is a de Polignac number, because none of the positive numbers 2^k-81337529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81337492 and 81337501.

It is not an unprimeable number, because it can be changed into a prime (81337523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167 + ... + 12755.

It is an arithmetic number, because the mean of its divisors is an integer number (6345360).

Almost surely, 2^81337529 is an apocalyptic number.

It is an amenable number.

81337529 is a deficient number, since it is larger than the sum of its proper divisors (20188231).

81337529 is a wasteful number, since it uses less digits than its factorization.

81337529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12680.

The product of its digits is 45360, while the sum is 38.

The square root of 81337529 is about 9018.7321170994. The cubic root of 81337529 is about 433.2750271978.

The spelling of 81337529 in words is "eighty-one million, three hundred thirty-seven thousand, five hundred twenty-nine".