81160713 has 6 divisors (see below), whose sum is σ = 117232154. Its totient is φ = 54107136.

The previous prime is 81160711. The next prime is 81160753. The reversal of 81160713 is 31706118.

It can be written as a sum of positive squares in only one way, i.e., 46621584 + 34539129 = 6828^2 + 5877^2 .

It is not a de Polignac number, because 81160713 - 2¹ = 81160711 is a prime.

It is a super-2 number, since 2×81160713² = 13174122669336738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81160711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4508920 + ... + 4508937.

Almost surely, 2^81160713 is an apocalyptic number.

It is an amenable number.

81160713 is a deficient number, since it is larger than the sum of its proper divisors (36071441).

81160713 is a wasteful number, since it uses less digits than its factorization.

81160713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9017863 (or 9017860 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 81160713 is about 9008.9240756041. The cubic root of 81160713 is about 432.9608403837.

It can be divided in two parts, 81 and 160713, that multiplied together give a triangular number (13017753 = T₅₁₀₂).

The spelling of 81160713 in words is "eighty-one million, one hundred sixty thousand, seven hundred thirteen".