91057512 has 128 divisors (see below), whose sum is σ = 282965760. Its totient is φ = 23777280.

The previous prime is 91057511. The next prime is 91057513. The reversal of 91057512 is 21575019.

It is an interprime number because it is at equal distance from previous prime (91057511) and next prime (91057513).

It is a self number, because there is not a number n which added to its sum of digits gives 91057512.

It is not an unprimeable number, because it can be changed into a prime (91057511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377712 + ... + 377952.

It is an arithmetic number, because the mean of its divisors is an integer number (2210670).

Almost surely, 2^91057512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91057512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141482880).

91057512 is an abundant number, since it is smaller than the sum of its proper divisors (191908248).

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

91057512 is a wasteful number, since it uses less digits than its factorization.

91057512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 91057512 is about 9542.4059859136. The cubic root of 91057512 is about 449.8888812056. Note that the first 5 decimals are identical.

The spelling of 91057512 in words is "ninety-one million, fifty-seven thousand, five hundred twelve".