11191257920 has 56 divisors (see below), whose sum is σ = 27508858368. Its totient is φ = 4332096000.

The previous prime is 11191257911. The next prime is 11191257929. The reversal of 11191257920 is 2975219111.

It is an interprime number because it is at equal distance from previous prime (11191257911) and next prime (11191257929).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11191257929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554156 + ... + 573995.

Almost surely, 2^11191257920 is an apocalyptic number.

11191257920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11191257920 is an abundant number, since it is smaller than the sum of its proper divisors (16317600448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11191257920 is a wasteful number, since it uses less digits than its factorization.

11191257920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128199 (or 1128189 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 38.

The spelling of 11191257920 in words is "eleven billion, one hundred ninety-one million, two hundred fifty-seven thousand, nine hundred twenty".