31303313213 has 4 divisors (see below), whose sum is σ = 31319509308. Its totient is φ = 31287117120.

The previous prime is 31303313201. The next prime is 31303313231. The reversal of 31303313213 is 31231330313.

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 6941722489 + 24361590724 = 83317^2 + 156082^2 .

It is a cyclic number.

It is not a de Polignac number, because 31303313213 - 2⁶ = 31303313149 is a prime.

It is a super-2 number, since 2×31303313213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303313113) 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, 8095148 + ... + 8099013.

It is an arithmetic number, because the mean of its divisors is an integer number (7829877327).

Almost surely, 2^31303313213 is an apocalyptic number.

It is an amenable number.

31303313213 is a deficient number, since it is larger than the sum of its proper divisors (16196095).

31303313213 is a wasteful number, since it uses less digits than its factorization.

31303313213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16196094.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 31303313213 its reverse (31231330313), we get a palindrome (62534643526).

The spelling of 31303313213 in words is "thirty-one billion, three hundred three million, three hundred thirteen thousand, two hundred thirteen".