11649319891 has 6 divisors (see below), whose sum is σ = 12804624476. Its totient is φ = 10590290700.

The previous prime is 11649319889. The next prime is 11649319909. The reversal of 11649319891 is 19891394611.

It is not a de Polignac number, because 11649319891 - 2¹ = 11649319889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11649319991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48137565 + ... + 48137806.

Almost surely, 2^11649319891 is an apocalyptic number.

11649319891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11649319891 is a deficient number, since it is larger than the sum of its proper divisors (1155304585).

11649319891 is an equidigital number, since it uses as much as digits as its factorization.

11649319891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96275393 (or 96275382 counting only the distinct ones).

The product of its digits is 419904, while the sum is 52.

The spelling of 11649319891 in words is "eleven billion, six hundred forty-nine million, three hundred nineteen thousand, eight hundred ninety-one".