99491901999 has 16 divisors (see below), whose sum is σ = 151701454080. Its totient is φ = 56816985600.

The previous prime is 99491901979. The next prime is 99491902001. The reversal of 99491901999 is 99910919499.

It is not a de Polignac number, because 99491901999 - 2¹⁵ = 99491869231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99491901979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1445989 + ... + 1513230.

It is an arithmetic number, because the mean of its divisors is an integer number (9481340880).

Almost surely, 2^99491901999 is an apocalyptic number.

99491901999 is a deficient number, since it is larger than the sum of its proper divisors (52209552081).

99491901999 is a wasteful number, since it uses less digits than its factorization.

99491901999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2960830.

The product of its (nonzero) digits is 19131876, while the sum is 69.

The spelling of 99491901999 in words is "ninety-nine billion, four hundred ninety-one million, nine hundred one thousand, nine hundred ninety-nine".