991234744969 has 16 divisors (see below), whose sum is σ = 1140863529600. Its totient is φ = 843616126080.

The previous prime is 991234744961. The next prime is 991234744993. The reversal of 991234744969 is 969447432199.

It is not a de Polignac number, because 991234744969 - 2³ = 991234744961 is a prime.

It is a super-2 number, since 2×991234744969² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991234744961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2674437 + ... + 3022429.

It is an arithmetic number, because the mean of its divisors is an integer number (71303970600).

Almost surely, 2^991234744969 is an apocalyptic number.

It is an amenable number.

991234744969 is a deficient number, since it is larger than the sum of its proper divisors (149628784631).

991234744969 is a wasteful number, since it uses less digits than its factorization.

991234744969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350880.

The product of its digits is 105815808, while the sum is 67.

The spelling of 991234744969 in words is "nine hundred ninety-one billion, two hundred thirty-four million, seven hundred forty-four thousand, nine hundred sixty-nine".