91555713 has 12 divisors (see below), whose sum is σ = 132380820. Its totient is φ = 60975456.

The previous prime is 91555703. The next prime is 91555733. The reversal of 91555713 is 31755519.

91555713 is a `hidden beast` number, since 91 + 5 + 557 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1912689 + 89643024 = 1383^2 + 9468^2 .

It is not a de Polignac number, because 91555713 - 2¹⁶ = 91490177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91555703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5395 + ... + 14567.

It is an arithmetic number, because the mean of its divisors is an integer number (11031735).

Almost surely, 2^91555713 is an apocalyptic number.

It is an amenable number.

91555713 is a deficient number, since it is larger than the sum of its proper divisors (40825107).

91555713 is a wasteful number, since it uses less digits than its factorization.

91555713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288 (or 10285 counting only the distinct ones).

The product of its digits is 23625, while the sum is 36.

The square root of 91555713 is about 9568.4749568570. The cubic root of 91555713 is about 450.7078784711.

The spelling of 91555713 in words is "ninety-one million, five hundred fifty-five thousand, seven hundred thirteen".