91798392637 has 4 divisors (see below), whose sum is σ = 104912448736. Its totient is φ = 78684336540.

The previous prime is 91798392619. The next prime is 91798392641. The reversal of 91798392637 is 73629389719.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91798392637 - 2²⁷ = 91664174909 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 (91798392607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6557028039 + ... + 6557028052.

It is an arithmetic number, because the mean of its divisors is an integer number (26228112184).

Almost surely, 2^91798392637 is an apocalyptic number.

It is an amenable number.

91798392637 is a deficient number, since it is larger than the sum of its proper divisors (13114056099).

91798392637 is a wasteful number, since it uses less digits than its factorization.

91798392637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13114056098.

The product of its digits is 30862944, while the sum is 64.

The spelling of 91798392637 in words is "ninety-one billion, seven hundred ninety-eight million, three hundred ninety-two thousand, six hundred thirty-seven".