11111111109931 has 4 divisors (see below), whose sum is σ = 12698412697072. Its totient is φ = 9523809522792.

The previous prime is 11111111109929. The next prime is 11111111109949. The reversal of 11111111109931 is 13990111111111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111111109931 - 2¹ = 11111111109929 is a prime.

It is a super-2 number, since 2×11111111109931² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111111109893 and 11111111109902.

It is not an unprimeable number, because it can be changed into a prime (11111111109911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793650793560 + ... + 793650793573.

It is an arithmetic number, because the mean of its divisors is an integer number (3174603174268).

Almost surely, 2^{11111111109931} is an apocalyptic number.

11111111109931 is a deficient number, since it is larger than the sum of its proper divisors (1587301587141).

11111111109931 is an equidigital number, since it uses as much as digits as its factorization.

11111111109931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587301587140.

The product of its (nonzero) digits is 243, while the sum is 31.

The spelling of 11111111109931 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred nine thousand, nine hundred thirty-one".