91213136 has 20 divisors (see below), whose sum is σ = 201972192. Its totient is φ = 39091296.

The previous prime is 91213127. The next prime is 91213139. The reversal of 91213136 is 63131219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91213139) 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, 407090 + ... + 407313.

Almost surely, 2^91213136 is an apocalyptic number.

It is an amenable number.

91213136 is an abundant number, since it is smaller than the sum of its proper divisors (110759056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91213136 is a wasteful number, since it uses less digits than its factorization.

91213136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814418 (or 814412 counting only the distinct ones).

The product of its digits is 972, while the sum is 26.

The square root of 91213136 is about 9550.5568424045. The cubic root of 91213136 is about 450.1450330868.

The spelling of 91213136 in words is "ninety-one million, two hundred thirteen thousand, one hundred thirty-six".