631261039 has 2 divisors, whose sum is σ = 631261040. Its totient is φ = 631261038.

The previous prime is 631261019. The next prime is 631261093. The reversal of 631261039 is 930162136.

631261039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (631261093) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631261039 - 2¹³ = 631252847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631261039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631261019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315630519 + 315630520.

It is an arithmetic number, because the mean of its divisors is an integer number (315630520).

Almost surely, 2^631261039 is an apocalyptic number.

631261039 is a deficient number, since it is larger than the sum of its proper divisors (1).

631261039 is an equidigital number, since it uses as much as digits as its factorization.

631261039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 631261039 is about 25124.9087361527. The cubic root of 631261039 is about 857.8334862140.

The spelling of 631261039 in words is "six hundred thirty-one million, two hundred sixty-one thousand, thirty-nine".