91713511 has 2 divisors, whose sum is σ = 91713512. Its totient is φ = 91713510.

The previous prime is 91713481. The next prime is 91713527. The reversal of 91713511 is 11531719.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91713511 - 2⁷ = 91713383 is a prime.

It is a super-2 number, since 2×91713511² = 16822736199894242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91713511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91713541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45856755 + 45856756.

It is an arithmetic number, because the mean of its divisors is an integer number (45856756).

Almost surely, 2^91713511 is an apocalyptic number.

91713511 is a deficient number, since it is larger than the sum of its proper divisors (1).

91713511 is an equidigital number, since it uses as much as digits as its factorization.

91713511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945, while the sum is 28.

The square root of 91713511 is about 9576.7171306247. The cubic root of 91713511 is about 450.9666643666.

The spelling of 91713511 in words is "ninety-one million, seven hundred thirteen thousand, five hundred eleven".