91420611639 has 8 divisors (see below), whose sum is σ = 139307598720. Its totient is φ = 52240349496.

The previous prime is 91420611637. The next prime is 91420611643. The reversal of 91420611639 is 93611602419.

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

It is not a de Polignac number, because 91420611639 - 2¹ = 91420611637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91420611639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91420611631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2176681209 + ... + 2176681250.

It is an arithmetic number, because the mean of its divisors is an integer number (17413449840).

Almost surely, 2^91420611639 is an apocalyptic number.

91420611639 is a deficient number, since it is larger than the sum of its proper divisors (47886987081).

91420611639 is a wasteful number, since it uses less digits than its factorization.

91420611639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353362469.

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 91420611639 in words is "ninety-one billion, four hundred twenty million, six hundred eleven thousand, six hundred thirty-nine".