11123113031 has 4 divisors (see below), whose sum is σ = 11135710872. Its totient is φ = 11110515192.

The previous prime is 11123112997. The next prime is 11123113033. The reversal of 11123113031 is 13031132111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11123113031 is a prime.

It is a super-2 number, since 2×11123113031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123113033) 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, 6297596 + ... + 6299361.

It is an arithmetic number, because the mean of its divisors is an integer number (2783927718).

Almost surely, 2^11123113031 is an apocalyptic number.

11123113031 is a deficient number, since it is larger than the sum of its proper divisors (12597841).

11123113031 is an equidigital number, since it uses as much as digits as its factorization.

11123113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597840.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 11123113031 its reverse (13031132111), we get a palindrome (24154245142).

The spelling of 11123113031 in words is "eleven billion, one hundred twenty-three million, one hundred thirteen thousand, thirty-one".