31312203313 has 4 divisors (see below), whose sum is σ = 31365006948. Its totient is φ = 31259399680.

The previous prime is 31312203311. The next prime is 31312203331. The reversal of 31312203313 is 31330221313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31330221313 = 13789 ⋅2272117.

It can be written as a sum of positive squares in 2 ways, for example, as 11039284624 + 20272918689 = 105068^2 + 142383^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312203313 - 2¹ = 31312203311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312203311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26400928 + ... + 26402113.

It is an arithmetic number, because the mean of its divisors is an integer number (7841251737).

Almost surely, 2^31312203313 is an apocalyptic number.

It is an amenable number.

31312203313 is a deficient number, since it is larger than the sum of its proper divisors (52803635).

31312203313 is an equidigital number, since it uses as much as digits as its factorization.

31312203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52803634.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31312203313 its reverse (31330221313), we get a palindrome (62642424626).

The spelling of 31312203313 in words is "thirty-one billion, three hundred twelve million, two hundred three thousand, three hundred thirteen".