91875136906 has 32 divisors (see below), whose sum is σ = 170168342400. Its totient is φ = 37058874048.

The previous prime is 91875136891. The next prime is 91875136919. The reversal of 91875136906 is 60963157819.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3927420 + ... + 3950743.

It is an arithmetic number, because the mean of its divisors is an integer number (5317760700).

Almost surely, 2^91875136906 is an apocalyptic number.

91875136906 is a deficient number, since it is larger than the sum of its proper divisors (78293205494).

91875136906 is a wasteful number, since it uses less digits than its factorization.

91875136906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878203 (or 7878189 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 91875136906 in words is "ninety-one billion, eight hundred seventy-five million, one hundred thirty-six thousand, nine hundred six".