11491138775 has 12 divisors (see below), whose sum is σ = 14449704624. Its totient is φ = 9063432000.

The previous prime is 11491138759. The next prime is 11491138777. The reversal of 11491138775 is 57783119411.

It is not a de Polignac number, because 11491138775 - 2⁴ = 11491138759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491138777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3235166 + ... + 3238715.

It is an arithmetic number, because the mean of its divisors is an integer number (1204142052).

Almost surely, 2^11491138775 is an apocalyptic number.

11491138775 is a deficient number, since it is larger than the sum of its proper divisors (2958565849).

11491138775 is an equidigital number, since it uses as much as digits as its factorization.

11491138775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473962 (or 6473957 counting only the distinct ones).

The product of its digits is 211680, while the sum is 47.

The spelling of 11491138775 in words is "eleven billion, four hundred ninety-one million, one hundred thirty-eight thousand, seven hundred seventy-five".