91900074239 has 4 divisors (see below), whose sum is σ = 91925812920. Its totient is φ = 91874335560.

The previous prime is 91900074191. The next prime is 91900074251. The reversal of 91900074239 is 93247000919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91900074239 is a prime.

It is a super-2 number, since 2×91900074239² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91900074239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91900074289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12863984 + ... + 12871125.

It is an arithmetic number, because the mean of its divisors is an integer number (22981453230).

Almost surely, 2^91900074239 is an apocalyptic number.

91900074239 is a deficient number, since it is larger than the sum of its proper divisors (25738681).

91900074239 is a wasteful number, since it uses less digits than its factorization.

91900074239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25738680.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 91900074239 in words is "ninety-one billion, nine hundred million, seventy-four thousand, two hundred thirty-nine".