631212013 has 2 divisors, whose sum is σ = 631212014. Its totient is φ = 631212012.

The previous prime is 631211899. The next prime is 631212037. The reversal of 631212013 is 310212136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628103844 + 3108169 = 25062^2 + 1763^2 .

It is a cyclic number.

It is not a de Polignac number, because 631212013 - 2²¹ = 629114861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631212073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315606006 + 315606007.

It is an arithmetic number, because the mean of its divisors is an integer number (315606007).

Almost surely, 2^631212013 is an apocalyptic number.

It is an amenable number.

631212013 is a deficient number, since it is larger than the sum of its proper divisors (1).

631212013 is an equidigital number, since it uses as much as digits as its factorization.

631212013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 631212013 is about 25123.9330718739. The cubic root of 631212013 is about 857.8112781623.

Adding to 631212013 its reverse (310212136), we get a palindrome (941424149).

The spelling of 631212013 in words is "six hundred thirty-one million, two hundred twelve thousand, thirteen".