631903 has 2 divisors, whose sum is σ = 631904. Its totient is φ = 631902.

The previous prime is 631901. The next prime is 631913. The reversal of 631903 is 309136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631903 - 2¹ = 631901 is a prime.

Together with 631901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315951 + 315952.

It is an arithmetic number, because the mean of its divisors is an integer number (315952).

2⁶³¹⁹⁰³ is an apocalyptic number.

631903 is a deficient number, since it is larger than the sum of its proper divisors (1).

631903 is an equidigital number, since it uses as much as digits as its factorization.

631903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 631903 is about 794.9232667371. The cubic root of 631903 is about 85.8124178990.

The spelling of 631903 in words is "six hundred thirty-one thousand, nine hundred three".