11538975481 has 24 divisors (see below), whose sum is σ = 13594531104. Its totient is φ = 9706616640.

The previous prime is 11538975467. The next prime is 11538975491. The reversal of 11538975481 is 18457983511.

It is not a de Polignac number, because 11538975481 - 2⁵ = 11538975449 is a prime.

It is a super-2 number, since 2×11538975481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11538975421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136965 + ... + 204541.

It is an arithmetic number, because the mean of its divisors is an integer number (566438796).

Almost surely, 2^11538975481 is an apocalyptic number.

11538975481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11538975481 is a deficient number, since it is larger than the sum of its proper divisors (2055555623).

11538975481 is a wasteful number, since it uses less digits than its factorization.

11538975481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67669 (or 67650 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 52.

The spelling of 11538975481 in words is "eleven billion, five hundred thirty-eight million, nine hundred seventy-five thousand, four hundred eighty-one".