81300513 has 16 divisors (see below), whose sum is σ = 124186496. Its totient is φ = 46344960.

The previous prime is 81300503. The next prime is 81300517. The reversal of 81300513 is 31500318.

It is a happy number.

It is not a de Polignac number, because 81300513 - 2⁵ = 81300481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 81300513.

It is not an unprimeable number, because it can be changed into a prime (81300517) 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, 4623 + ... + 13563.

It is an arithmetic number, because the mean of its divisors is an integer number (7761656).

Almost surely, 2^81300513 is an apocalyptic number.

It is an amenable number.

81300513 is a deficient number, since it is larger than the sum of its proper divisors (42885983).

81300513 is a wasteful number, since it uses less digits than its factorization.

81300513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 81300513 is about 9016.6797104034. The cubic root of 81300513 is about 433.2092906629.

The spelling of 81300513 in words is "eighty-one million, three hundred thousand, five hundred thirteen".