11125312031 has 4 divisors (see below), whose sum is σ = 11125727712. Its totient is φ = 11124896352.

The previous prime is 11125312027. The next prime is 11125312043. The reversal of 11125312031 is 13021352111.

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 11125312031 - 2² = 11125312027 is a prime.

It is a super-2 number, since 2×11125312031² (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 = 11125311994 and 11125312012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11125312001) 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 3 ways as a sum of consecutive naturals, for example, 164711 + ... + 222216.

It is an arithmetic number, because the mean of its divisors is an integer number (2781431928).

Almost surely, 2^11125312031 is an apocalyptic number.

11125312031 is a deficient number, since it is larger than the sum of its proper divisors (415681).

11125312031 is an equidigital number, since it uses as much as digits as its factorization.

11125312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415680.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 11125312031 its reverse (13021352111), we get a palindrome (24146664142).

The spelling of 11125312031 in words is "eleven billion, one hundred twenty-five million, three hundred twelve thousand, thirty-one".