91051572 has 96 divisors (see below), whose sum is σ = 237081600. Its totient is φ = 27067392.

The previous prime is 91051567. The next prime is 91051579. The reversal of 91051572 is 27515019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91051579) 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, 508579 + ... + 508757.

It is an arithmetic number, because the mean of its divisors is an integer number (2469600).

Almost surely, 2^91051572 is an apocalyptic number.

91051572 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91051572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118540800).

91051572 is an abundant number, since it is smaller than the sum of its proper divisors (146030028).

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

91051572 is a wasteful number, since it uses less digits than its factorization.

91051572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 323 counting only the distinct ones).

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

The square root of 91051572 is about 9542.0947385781. The cubic root of 91051572 is about 449.8790983844.

The spelling of 91051572 in words is "ninety-one million, fifty-one thousand, five hundred seventy-two".