31124232113 has 4 divisors (see below), whose sum is σ = 33518403828. Its totient is φ = 28730060400.

The previous prime is 31124232071. The next prime is 31124232149. The reversal of 31124232113 is 31123242113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31123242113 = 3923 ⋅7933531.

It can be written as a sum of positive squares in 2 ways, for example, as 11048742769 + 20075489344 = 105113^2 + 141688^2 .

It is a cyclic number.

It is not a de Polignac number, because 31124232113 - 2³² = 26829264817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31124232313) 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, 1197085838 + ... + 1197085863.

It is an arithmetic number, because the mean of its divisors is an integer number (8379600957).

Almost surely, 2^31124232113 is an apocalyptic number.

It is an amenable number.

31124232113 is a deficient number, since it is larger than the sum of its proper divisors (2394171715).

31124232113 is a wasteful number, since it uses less digits than its factorization.

31124232113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394171714.

The product of its digits is 864, while the sum is 23.

Adding to 31124232113 its reverse (31123242113), we get a palindrome (62247474226).

The spelling of 31124232113 in words is "thirty-one billion, one hundred twenty-four million, two hundred thirty-two thousand, one hundred thirteen".