31223141513 has 2 divisors, whose sum is σ = 31223141514. Its totient is φ = 31223141512.

The previous prime is 31223141471. The next prime is 31223141557. The reversal of 31223141513 is 31514132213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20292857209 + 10930284304 = 142453^2 + 104548^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223141513 - 2⁶ = 31223141449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31223141413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611570756 + 15611570757.

It is an arithmetic number, because the mean of its divisors is an integer number (15611570757).

Almost surely, 2^31223141513 is an apocalyptic number.

It is an amenable number.

31223141513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223141513 is an equidigital number, since it uses as much as digits as its factorization.

31223141513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

Adding to 31223141513 its reverse (31514132213), we get a palindrome (62737273726).

The spelling of 31223141513 in words is "thirty-one billion, two hundred twenty-three million, one hundred forty-one thousand, five hundred thirteen".