91425897 has 24 divisors (see below), whose sum is σ = 138250944. Its totient is φ = 58110624.

The previous prime is 91425889. The next prime is 91425931. The reversal of 91425897 is 79852419.

It is not a de Polignac number, because 91425897 - 2³ = 91425889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91425097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91203 + ... + 92199.

It is an arithmetic number, because the mean of its divisors is an integer number (5760456).

Almost surely, 2^91425897 is an apocalyptic number.

It is an amenable number.

91425897 is a deficient number, since it is larger than the sum of its proper divisors (46825047).

91425897 is a wasteful number, since it uses less digits than its factorization.

91425897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1466 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 91425897 is about 9561.6890244350. The cubic root of 91425897 is about 450.4947595332.

The spelling of 91425897 in words is "ninety-one million, four hundred twenty-five thousand, eight hundred ninety-seven".