631869137 has 2 divisors, whose sum is σ = 631869138. Its totient is φ = 631869136.

The previous prime is 631869113. The next prime is 631869167. The reversal of 631869137 is 731968136.

631869137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 516607441 + 115261696 = 22729^2 + 10736^2 .

It is a cyclic number.

It is not a de Polignac number, because 631869137 - 2¹⁰ = 631868113 is a prime.

It is not a weakly prime, because it can be changed into another prime (631869167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315934568 + 315934569.

It is an arithmetic number, because the mean of its divisors is an integer number (315934569).

Almost surely, 2^631869137 is an apocalyptic number.

It is an amenable number.

631869137 is a deficient number, since it is larger than the sum of its proper divisors (1).

631869137 is an equidigital number, since it uses as much as digits as its factorization.

631869137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 631869137 is about 25137.0073198860. The cubic root of 631869137 is about 858.1088500665.

The spelling of 631869137 in words is "six hundred thirty-one million, eight hundred sixty-nine thousand, one hundred thirty-seven".