91156109925 has 48 divisors (see below), whose sum is σ = 155886848000. Its totient is φ = 46953432000.

The previous prime is 91156109923. The next prime is 91156109953. The reversal of 91156109925 is 52990165119.

It is not a de Polignac number, because 91156109925 - 2¹ = 91156109923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91156109923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1120890 + ... + 1199460.

Almost surely, 2^91156109925 is an apocalyptic number.

It is an amenable number.

91156109925 is a deficient number, since it is larger than the sum of its proper divisors (64730738075).

91156109925 is a wasteful number, since it uses less digits than its factorization.

91156109925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79114 (or 79109 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 48.

The spelling of 91156109925 in words is "ninety-one billion, one hundred fifty-six million, one hundred nine thousand, nine hundred twenty-five".