90991429691 has 16 divisors (see below), whose sum is σ = 95521198080. Its totient is φ = 86510682720.

The previous prime is 90991429687. The next prime is 90991429699. The reversal of 90991429691 is 19692419909.

It is a cyclic number.

It is not a de Polignac number, because 90991429691 - 2² = 90991429687 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 90991429691.

It is not an unprimeable number, because it can be changed into a prime (90991429699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3376850 + ... + 3403688.

It is an arithmetic number, because the mean of its divisors is an integer number (5970074880).

Almost surely, 2^90991429691 is an apocalyptic number.

90991429691 is a deficient number, since it is larger than the sum of its proper divisors (4529768389).

90991429691 is a wasteful number, since it uses less digits than its factorization.

90991429691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27746.

The product of its (nonzero) digits is 2834352, while the sum is 59.

The spelling of 90991429691 in words is "ninety billion, nine hundred ninety-one million, four hundred twenty-nine thousand, six hundred ninety-one".