31311323413 has 4 divisors (see below), whose sum is σ = 31311749068. Its totient is φ = 31310897760.

The previous prime is 31311323399. The next prime is 31311323471. The reversal of 31311323413 is 31432311313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21122843569 + 10188479844 = 145337^2 + 100938^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311323413 - 2³³ = 22721388821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311323213) 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, 70968 + ... + 260113.

It is an arithmetic number, because the mean of its divisors is an integer number (7827937267).

Almost surely, 2^31311323413 is an apocalyptic number.

It is an amenable number.

31311323413 is a deficient number, since it is larger than the sum of its proper divisors (425655).

31311323413 is an equidigital number, since it uses as much as digits as its factorization.

31311323413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425654.

The product of its digits is 1944, while the sum is 25.

Adding to 31311323413 its reverse (31432311313), we get a palindrome (62743634726).

The spelling of 31311323413 in words is "thirty-one billion, three hundred eleven million, three hundred twenty-three thousand, four hundred thirteen".