99491223489 has 16 divisors (see below), whose sum is σ = 152452638720. Its totient is φ = 56534515920.

The previous prime is 99491223473. The next prime is 99491223493. The reversal of 99491223489 is 98432219499.

It is not a de Polignac number, because 99491223489 - 2⁴ = 99491223473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99491223449) 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, 13229977 + ... + 13237494.

It is an arithmetic number, because the mean of its divisors is an integer number (9528289920).

Almost surely, 2^99491223489 is an apocalyptic number.

It is an amenable number.

99491223489 is a deficient number, since it is larger than the sum of its proper divisors (52961415231).

99491223489 is a wasteful number, since it uses less digits than its factorization.

99491223489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26467660.

The product of its digits is 10077696, while the sum is 60.

The spelling of 99491223489 in words is "ninety-nine billion, four hundred ninety-one million, two hundred twenty-three thousand, four hundred eighty-nine".