31020223313 has 2 divisors, whose sum is σ = 31020223314. Its totient is φ = 31020223312.

The previous prime is 31020223309. The next prime is 31020223319. The reversal of 31020223313 is 31332202013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30941865409 + 78357904 = 175903^2 + 8852^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020223313 - 2² = 31020223309 is a prime.

It is not a weakly prime, because it can be changed into another prime (31020223319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510111656 + 15510111657.

It is an arithmetic number, because the mean of its divisors is an integer number (15510111657).

Almost surely, 2^31020223313 is an apocalyptic number.

It is an amenable number.

31020223313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020223313 is an equidigital number, since it uses as much as digits as its factorization.

31020223313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31020223313 its reverse (31332202013), we get a palindrome (62352425326).

The spelling of 31020223313 in words is "thirty-one billion, twenty million, two hundred twenty-three thousand, three hundred thirteen".