91432138187 has 8 divisors (see below), whose sum is σ = 98560163520. Its totient is φ = 84317653440.

The previous prime is 91432138151. The next prime is 91432138201. The reversal of 91432138187 is 78183123419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91432138187 - 2¹⁰ = 91432137163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91432138687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3371114 + ... + 3398127.

It is an arithmetic number, because the mean of its divisors is an integer number (12320020440).

Almost surely, 2^91432138187 is an apocalyptic number.

91432138187 is a deficient number, since it is larger than the sum of its proper divisors (7128025333).

91432138187 is a wasteful number, since it uses less digits than its factorization.

91432138187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770293.

The product of its digits is 290304, while the sum is 47.

The spelling of 91432138187 in words is "ninety-one billion, four hundred thirty-two million, one hundred thirty-eight thousand, one hundred eighty-seven".