81713017 has 4 divisors (see below), whose sum is σ = 81743760. Its totient is φ = 81682276.

The previous prime is 81712991. The next prime is 81713063. The reversal of 81713017 is 71031718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81713017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81713077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10963 + ... + 16840.

It is an arithmetic number, because the mean of its divisors is an integer number (20435940).

Almost surely, 2^81713017 is an apocalyptic number.

It is an amenable number.

81713017 is a deficient number, since it is larger than the sum of its proper divisors (30743).

81713017 is a wasteful number, since it uses less digits than its factorization.

81713017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30742.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 81713017 is about 9039.5252640833. The cubic root of 81713017 is about 433.9407300119.

The spelling of 81713017 in words is "eighty-one million, seven hundred thirteen thousand, seventeen".