31125531113 has 4 divisors (see below), whose sum is σ = 31128328068. Its totient is φ = 31122734160.

The previous prime is 31125531109. The next prime is 31125531163. The reversal of 31125531113 is 31113552113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31113552113 = 7 ⋅4444793159.

It can be written as a sum of positive squares in 2 ways, for example, as 20458153024 + 10667378089 = 143032^2 + 103283^2 .

It is a cyclic number.

It is not a de Polignac number, because 31125531113 - 2² = 31125531109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31125531163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381718 + ... + 1404063.

It is an arithmetic number, because the mean of its divisors is an integer number (7782082017).

Almost surely, 2^31125531113 is an apocalyptic number.

It is an amenable number.

31125531113 is a deficient number, since it is larger than the sum of its proper divisors (2796955).

31125531113 is a wasteful number, since it uses less digits than its factorization.

31125531113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796954.

The product of its digits is 1350, while the sum is 26.

The spelling of 31125531113 in words is "thirty-one billion, one hundred twenty-five million, five hundred thirty-one thousand, one hundred thirteen".