91581725 has 12 divisors (see below), whose sum is σ = 113936160. Its totient is φ = 73023600.

The previous prime is 91581683. The next prime is 91581727. The reversal of 91581725 is 52718519.

It is not a de Polignac number, because 91581725 - 2⁶ = 91581661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91581727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1886 + ... + 13664.

It is an arithmetic number, because the mean of its divisors is an integer number (9494680).

Almost surely, 2^91581725 is an apocalyptic number.

It is an amenable number.

91581725 is a deficient number, since it is larger than the sum of its proper divisors (22354435).

91581725 is a wasteful number, since it uses less digits than its factorization.

91581725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12100 (or 12095 counting only the distinct ones).

The product of its digits is 25200, while the sum is 38.

The square root of 91581725 is about 9569.8341155947. The cubic root of 91581725 is about 450.7505581424.

The spelling of 91581725 in words is "ninety-one million, five hundred eighty-one thousand, seven hundred twenty-five".