31320130213 has 4 divisors (see below), whose sum is σ = 31322467660. Its totient is φ = 31317792768.

The previous prime is 31320130207. The next prime is 31320130229. The reversal of 31320130213 is 31203102313.

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 13938871969 + 17381258244 = 118063^2 + 131838^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320130213 - 2¹⁷ = 31319999141 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 (31320130243) 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, 1148508 + ... + 1175461.

It is an arithmetic number, because the mean of its divisors is an integer number (7830616915).

Almost surely, 2^31320130213 is an apocalyptic number.

It is an amenable number.

31320130213 is a deficient number, since it is larger than the sum of its proper divisors (2337447).

31320130213 is a wasteful number, since it uses less digits than its factorization.

31320130213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337446.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31320130213 its reverse (31203102313), we get a palindrome (62523232526).

The spelling of 31320130213 in words is "thirty-one billion, three hundred twenty million, one hundred thirty thousand, two hundred thirteen".