91135613 has 4 divisors (see below), whose sum is σ = 91154748. Its totient is φ = 91116480.

The previous prime is 91135607. The next prime is 91135631. The reversal of 91135613 is 31653119.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62694724 + 28440889 = 7918^2 + 5333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91135613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91135643) 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, 3845 + ... + 14037.

It is an arithmetic number, because the mean of its divisors is an integer number (22788687).

Almost surely, 2^91135613 is an apocalyptic number.

It is an amenable number.

91135613 is a deficient number, since it is larger than the sum of its proper divisors (19135).

91135613 is a wasteful number, since it uses less digits than its factorization.

91135613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19134.

The product of its digits is 2430, while the sum is 29.

The square root of 91135613 is about 9546.4974205203. The cubic root of 91135613 is about 450.0174692807.

The spelling of 91135613 in words is "ninety-one million, one hundred thirty-five thousand, six hundred thirteen".