81612713 has 16 divisors (see below), whose sum is σ = 103165440. Its totient is φ = 62824896.

The previous prime is 81612703. The next prime is 81612721. The reversal of 81612713 is 31721618.

It is a cyclic number.

It is not a de Polignac number, because 81612713 - 2⁴ = 81612697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81612703) 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, 8753 + ... + 15486.

It is an arithmetic number, because the mean of its divisors is an integer number (6447840).

Almost surely, 2^81612713 is an apocalyptic number.

It is an amenable number.

81612713 is a deficient number, since it is larger than the sum of its proper divisors (21552727).

81612713 is a wasteful number, since it uses less digits than its factorization.

81612713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24296.

The product of its digits is 2016, while the sum is 29.

The square root of 81612713 is about 9033.9754814810. The cubic root of 81612713 is about 433.7631009782.

The spelling of 81612713 in words is "eighty-one million, six hundred twelve thousand, seven hundred thirteen".