91142878925 has 24 divisors (see below), whose sum is σ = 130718675136. Its totient is φ = 61744976640.

The previous prime is 91142878921. The next prime is 91142879011. The reversal of 91142878925 is 52987824119.

It is not a de Polignac number, because 91142878925 - 2² = 91142878921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91142878921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3122924 + ... + 3151973.

It is an arithmetic number, because the mean of its divisors is an integer number (5446611464).

Almost surely, 2^91142878925 is an apocalyptic number.

It is an amenable number.

91142878925 is a deficient number, since it is larger than the sum of its proper divisors (39575796211).

91142878925 is a wasteful number, since it uses less digits than its factorization.

91142878925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274997 (or 6274992 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 56.

The spelling of 91142878925 in words is "ninety-one billion, one hundred forty-two million, eight hundred seventy-eight thousand, nine hundred twenty-five".