11311477881 has 16 divisors (see below), whose sum is σ = 16475540160. Its totient is φ = 6846073920.

The previous prime is 11311477871. The next prime is 11311477909. The reversal of 11311477881 is 18877411311.

It is not a de Polignac number, because 11311477881 - 2²² = 11307283577 is a prime.

It is a super-2 number, since 2×11311477881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11311477831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209626 + ... + 258003.

It is an arithmetic number, because the mean of its divisors is an integer number (1029721260).

Almost surely, 2^11311477881 is an apocalyptic number.

11311477881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11311477881 is a deficient number, since it is larger than the sum of its proper divisors (5164062279).

11311477881 is a wasteful number, since it uses less digits than its factorization.

11311477881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468376.

The product of its digits is 37632, while the sum is 42.

The spelling of 11311477881 in words is "eleven billion, three hundred eleven million, four hundred seventy-seven thousand, eight hundred eighty-one".