11311111031 has 8 divisors (see below), whose sum is σ = 12342031104. Its totient is φ = 10280630520.

The previous prime is 11311111013. The next prime is 11311111061. The reversal of 11311111031 is 13011111311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11311111031 is a prime.

It is a super-2 number, since 2×11311111031² (a number of 21 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 = 11311110997 and 11311111015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311111061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54881 + ... + 160106.

It is an arithmetic number, because the mean of its divisors is an integer number (1542753888).

Almost surely, 2^11311111031 is an apocalyptic number.

11311111031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11311111031 is a deficient number, since it is larger than the sum of its proper divisors (1030920073).

11311111031 is a wasteful number, since it uses less digits than its factorization.

11311111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219781.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 11311111031 its reverse (13011111311), we get a palindrome (24322222342).

The spelling of 11311111031 in words is "eleven billion, three hundred eleven million, one hundred eleven thousand, thirty-one".