31131230131 has 4 divisors (see below), whose sum is σ = 31134341200. Its totient is φ = 31128119064.

The previous prime is 31131230129. The next prime is 31131230147. The reversal of 31131230131 is 13103213113.

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 31131230131 - 2¹ = 31131230129 is a prime.

It is a super-2 number, since 2×31131230131² (a number of 22 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 = 31131230099 and 31131230108.

It is not an unprimeable number, because it can be changed into a prime (31131230191) 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, 1540476 + ... + 1560553.

It is an arithmetic number, because the mean of its divisors is an integer number (7783585300).

Almost surely, 2^31131230131 is an apocalyptic number.

31131230131 is a deficient number, since it is larger than the sum of its proper divisors (3111069).

31131230131 is a wasteful number, since it uses less digits than its factorization.

31131230131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111068.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31131230131 its reverse (13103213113), we get a palindrome (44234443244).

The spelling of 31131230131 in words is "thirty-one billion, one hundred thirty-one million, two hundred thirty thousand, one hundred thirty-one".