91162175940 has 144 divisors (see below), whose sum is σ = 317541107520. Its totient is φ = 20936759040.

The previous prime is 91162175933. The next prime is 91162175947. The reversal of 91162175940 is 4957126119.

91162175940 is a `hidden beast` number, since 9 + 11 + 621 + 7 + 5 + 9 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (91162175933) and next prime (91162175947).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (91162175947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1173999 + ... + 1249238.

It is an arithmetic number, because the mean of its divisors is an integer number (2205146580).

Almost surely, 2^91162175940 is an apocalyptic number.

91162175940 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91162175940 is an abundant number, since it is smaller than the sum of its proper divisors (226378931580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91162175940 is a wasteful number, since it uses less digits than its factorization.

91162175940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423282 (or 2423277 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 91162175940 in words is "ninety-one billion, one hundred sixty-two million, one hundred seventy-five thousand, nine hundred forty".