91420136999 has 8 divisors (see below), whose sum is σ = 94051837152. Its totient is φ = 88807576960.

The previous prime is 91420136963. The next prime is 91420137007. The reversal of 91420136999 is 99963102419.

It is a happy number.

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 91420136999 - 2³⁶ = 22700660263 is a prime.

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 91420136999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91420136099) 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, 4775339 + ... + 4794444.

It is an arithmetic number, because the mean of its divisors is an integer number (11756479644).

Almost surely, 2^91420136999 is an apocalyptic number.

91420136999 is a deficient number, since it is larger than the sum of its proper divisors (2631700153).

91420136999 is a wasteful number, since it uses less digits than its factorization.

91420136999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9570057.

The product of its (nonzero) digits is 944784, while the sum is 53.

The spelling of 91420136999 in words is "ninety-one billion, four hundred twenty million, one hundred thirty-six thousand, nine hundred ninety-nine".