81292713 has 8 divisors (see below), whose sum is σ = 112128000. Its totient is φ = 52326288.

The previous prime is 81292681. The next prime is 81292733. The reversal of 81292713 is 31729218.

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

It is not a de Polignac number, because 81292713 - 2⁵ = 81292681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81292733) 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, 467113 + ... + 467286.

It is an arithmetic number, because the mean of its divisors is an integer number (14016000).

Almost surely, 2^81292713 is an apocalyptic number.

It is an amenable number.

81292713 is a deficient number, since it is larger than the sum of its proper divisors (30835287).

81292713 is a wasteful number, since it uses less digits than its factorization.

81292713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934431.

The product of its digits is 6048, while the sum is 33.

The square root of 81292713 is about 9016.2471683068. The cubic root of 81292713 is about 433.1954361356.

The spelling of 81292713 in words is "eighty-one million, two hundred ninety-two thousand, seven hundred thirteen".