631216155313 has 2 divisors, whose sum is σ = 631216155314. Its totient is φ = 631216155312.

The previous prime is 631216155307. The next prime is 631216155331. The reversal of 631216155313 is 313551612136.

Together with next prime (631216155331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387117907344 + 244098247969 = 622188^2 + 494063^2 .

It is a cyclic number.

It is not a de Polignac number, because 631216155313 - 2⁵ = 631216155281 is a prime.

It is not a weakly prime, because it can be changed into another prime (631216155373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315608077656 + 315608077657.

It is an arithmetic number, because the mean of its divisors is an integer number (315608077657).

Almost surely, 2^631216155313 is an apocalyptic number.

It is an amenable number.

631216155313 is a deficient number, since it is larger than the sum of its proper divisors (1).

631216155313 is an equidigital number, since it uses as much as digits as its factorization.

631216155313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 37.

Adding to 631216155313 its reverse (313551612136), we get a palindrome (944767767449).

The spelling of 631216155313 in words is "six hundred thirty-one billion, two hundred sixteen million, one hundred fifty-five thousand, three hundred thirteen".