91912442804639 has 4 divisors (see below), whose sum is σ = 91912639295280. Its totient is φ = 91912246314000.

The previous prime is 91912442804587. The next prime is 91912442804719. The reversal of 91912442804639 is 93640824421919.

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-91912442804639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91912442804239) 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, 97541987 + ... + 98479764.

It is an arithmetic number, because the mean of its divisors is an integer number (22978159823820).

Almost surely, 2^{91912442804639} is an apocalyptic number.

91912442804639 is a deficient number, since it is larger than the sum of its proper divisors (196490641).

91912442804639 is a wasteful number, since it uses less digits than its factorization.

91912442804639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196490640.

The product of its (nonzero) digits is 26873856, while the sum is 62.

The spelling of 91912442804639 in words is "ninety-one trillion, nine hundred twelve billion, four hundred forty-two million, eight hundred four thousand, six hundred thirty-nine".