31302131020013 has 4 divisors (see below), whose sum is σ = 35773864022880. Its totient is φ = 26830398017148.

The previous prime is 31302131020001. The next prime is 31302131020151. The reversal of 31302131020013 is 31002013120313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31302131020013 - 2¹⁴ = 31302131003629 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 (31302131020313) 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, 2235866501423 + ... + 2235866501436.

It is an arithmetic number, because the mean of its divisors is an integer number (8943466005720).

Almost surely, 2^{31302131020013} is an apocalyptic number.

It is an amenable number.

31302131020013 is a deficient number, since it is larger than the sum of its proper divisors (4471733002867).

31302131020013 is an equidigital number, since it uses as much as digits as its factorization.

31302131020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471733002866.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31302131020013 its reverse (31002013120313), we get a palindrome (62304144140326).

The spelling of 31302131020013 in words is "thirty-one trillion, three hundred two billion, one hundred thirty-one million, twenty thousand, thirteen".