91245573 has 6 divisors (see below), whose sum is σ = 131799174. Its totient is φ = 60830376.

The previous prime is 91245533. The next prime is 91245587. The reversal of 91245573 is 37554219.

It can be written as a sum of positive squares in only one way, i.e., 89075844 + 2169729 = 9438^2 + 1473^2 .

It is not a de Polignac number, because 91245573 - 2⁶ = 91245509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91245533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5069190 + ... + 5069207.

It is an arithmetic number, because the mean of its divisors is an integer number (21966529).

Almost surely, 2^91245573 is an apocalyptic number.

It is an amenable number.

91245573 is a deficient number, since it is larger than the sum of its proper divisors (40553601).

91245573 is a wasteful number, since it uses less digits than its factorization.

91245573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138403 (or 10138400 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 91245573 is about 9552.2548646903. The cubic root of 91245573 is about 450.1983866007.

The spelling of 91245573 in words is "ninety-one million, two hundred forty-five thousand, five hundred seventy-three".