631559 has 2 divisors, whose sum is σ = 631560. Its totient is φ = 631558.

The previous prime is 631549. The next prime is 631573. The reversal of 631559 is 955136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631559 - 2¹⁶ = 566023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315779 + 315780.

It is an arithmetic number, because the mean of its divisors is an integer number (315780).

2⁶³¹⁵⁵⁹ is an apocalyptic number.

631559 is a deficient number, since it is larger than the sum of its proper divisors (1).

631559 is an equidigital number, since it uses as much as digits as its factorization.

631559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 29.

The square root of 631559 is about 794.7068641958. The cubic root of 631559 is about 85.7968433408.

The spelling of 631559 in words is "six hundred thirty-one thousand, five hundred fifty-nine".