91713031 has 4 divisors (see below), whose sum is σ = 91744072. Its totient is φ = 91681992.

The previous prime is 91713007. The next prime is 91713053. The reversal of 91713031 is 13031719.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91713031 - 2⁷ = 91712903 is a prime.

It is a super-2 number, since 2×91713031² = 16822560110413922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91712987 and 91713005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91713001) 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, 10560 + ... + 17173.

It is an arithmetic number, because the mean of its divisors is an integer number (22936018).

Almost surely, 2^91713031 is an apocalyptic number.

91713031 is a deficient number, since it is larger than the sum of its proper divisors (31041).

91713031 is a wasteful number, since it uses less digits than its factorization.

91713031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31040.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 91713031 is about 9576.6920698120. The cubic root of 91713031 is about 450.9658776255.

The spelling of 91713031 in words is "ninety-one million, seven hundred thirteen thousand, thirty-one".