91172245268 has 24 divisors (see below), whose sum is σ = 171832833480. Its totient is φ = 42077485440.

The previous prime is 91172245247. The next prime is 91172245303. The reversal of 91172245268 is 86254227119.

It can be written as a sum of positive squares in 4 ways, for example, as 15099985924 + 76072259344 = 122882^2 + 275812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049098 + ... + 2093118.

It is an arithmetic number, because the mean of its divisors is an integer number (7159701395).

Almost surely, 2^91172245268 is an apocalyptic number.

It is an amenable number.

91172245268 is a deficient number, since it is larger than the sum of its proper divisors (80660588212).

91172245268 is a wasteful number, since it uses less digits than its factorization.

91172245268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83867 (or 83865 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The spelling of 91172245268 in words is "ninety-one billion, one hundred seventy-two million, two hundred forty-five thousand, two hundred sixty-eight".