99409189837691 has 4 divisors (see below), whose sum is σ = 99929656800384. Its totient is φ = 98888722875000.

The previous prime is 99409189837673. The next prime is 99409189837709. The reversal of 99409189837691 is 19673898190499.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (99409189837673) and next prime (99409189837709).

It is a cyclic number.

It is not a de Polignac number, because 99409189837691 - 2⁴⁶ = 29040445660027 is a prime.

It is a super-2 number, since 2×99409189837691² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99409189837591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260233481060 + ... + 260233481441.

It is an arithmetic number, because the mean of its divisors is an integer number (24982414200096).

Almost surely, 2^{99409189837691} is an apocalyptic number.

99409189837691 is a deficient number, since it is larger than the sum of its proper divisors (520466962693).

99409189837691 is a wasteful number, since it uses less digits than its factorization.

99409189837691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520466962692.

The product of its (nonzero) digits is 1904684544, while the sum is 83.

The spelling of 99409189837691 in words is "ninety-nine trillion, four hundred nine billion, one hundred eighty-nine million, eight hundred thirty-seven thousand, six hundred ninety-one".