99434987491 has 12 divisors (see below), whose sum is σ = 115841180712. Its totient is φ = 85103319168.

The previous prime is 99434987447. The next prime is 99434987537. The reversal of 99434987491 is 19478943499.

It is not a de Polignac number, because 99434987491 - 2⁹ = 99434986979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99434987791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1474665 + ... + 1540618.

It is an arithmetic number, because the mean of its divisors is an integer number (9653431726).

Almost surely, 2^99434987491 is an apocalyptic number.

99434987491 is a deficient number, since it is larger than the sum of its proper divisors (16406193221).

99434987491 is a wasteful number, since it uses less digits than its factorization.

99434987491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015970 (or 3015963 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 67.

The spelling of 99434987491 in words is "ninety-nine billion, four hundred thirty-four million, nine hundred eighty-seven thousand, four hundred ninety-one".