31121303131 has 8 divisors (see below), whose sum is σ = 31179625920. Its totient is φ = 31063023552.

The previous prime is 31121303119. The next prime is 31121303149. The reversal of 31121303131 is 13130312113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121303131 is a prime.

It is a super-2 number, since 2×31121303131² (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 = 31121303099 and 31121303108.

It is not an unprimeable number, because it can be changed into a prime (31121303111) 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 7 ways as a sum of consecutive naturals, for example, 1668151 + ... + 1686703.

It is an arithmetic number, because the mean of its divisors is an integer number (3897453240).

Almost surely, 2^31121303131 is an apocalyptic number.

31121303131 is a deficient number, since it is larger than the sum of its proper divisors (58322789).

31121303131 is a wasteful number, since it uses less digits than its factorization.

31121303131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21605.

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

Adding to 31121303131 its reverse (13130312113), we get a palindrome (44251615244).

The spelling of 31121303131 in words is "thirty-one billion, one hundred twenty-one million, three hundred three thousand, one hundred thirty-one".