31131202123 has 8 divisors (see below), whose sum is σ = 35584068320. Its totient is φ = 26679723840.

The previous prime is 31131202073. The next prime is 31131202139. The reversal of 31131202123 is 32120213113.

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

It is not a de Polignac number, because 31131202123 - 2³³ = 22541267531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31131202123.

It is not an unprimeable number, because it can be changed into a prime (31131208123) 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 7 ways as a sum of consecutive naturals, for example, 298458 + ... + 389023.

It is an arithmetic number, because the mean of its divisors is an integer number (4448008540).

Almost surely, 2^31131202123 is an apocalyptic number.

31131202123 is a deficient number, since it is larger than the sum of its proper divisors (4452866197).

31131202123 is an equidigital number, since it uses as much as digits as its factorization.

31131202123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693957.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31131202123 its reverse (32120213113), we get a palindrome (63251415236).

The spelling of 31131202123 in words is "thirty-one billion, one hundred thirty-one million, two hundred two thousand, one hundred twenty-three".