81346513 has 8 divisors (see below), whose sum is σ = 86360040. Its totient is φ = 76358400.

The previous prime is 81346493. The next prime is 81346541. The reversal of 81346513 is 31564318.

It can be written as a sum of positive squares in 4 ways, for example, as 8363664 + 72982849 = 2892^2 + 8543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81346513 - 2²⁵ = 47792081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81346913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463 + ... + 12763.

It is an arithmetic number, because the mean of its divisors is an integer number (10795005).

Almost surely, 2^81346513 is an apocalyptic number.

It is an amenable number.

81346513 is a deficient number, since it is larger than the sum of its proper divisors (5013527).

81346513 is a wasteful number, since it uses less digits than its factorization.

81346513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12707.

The product of its digits is 8640, while the sum is 31.

The square root of 81346513 is about 9019.2301777923. The cubic root of 81346513 is about 433.2909788321.

The spelling of 81346513 in words is "eighty-one million, three hundred forty-six thousand, five hundred thirteen".