631913 has 2 divisors, whose sum is σ = 631914. Its totient is φ = 631912.

The previous prime is 631903. The next prime is 631927. The reversal of 631913 is 319136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619369 + 12544 = 787^2 + 112^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631913 is a prime.

It is not a weakly prime, because it can be changed into another prime (631903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315956 + 315957.

It is an arithmetic number, because the mean of its divisors is an integer number (315957).

2⁶³¹⁹¹³ is an apocalyptic number.

It is an amenable number.

631913 is a deficient number, since it is larger than the sum of its proper divisors (1).

631913 is an equidigital number, since it uses as much as digits as its factorization.

631913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 23.

The square root of 631913 is about 794.9295566275. The cubic root of 631913 is about 85.8128705632.

The spelling of 631913 in words is "six hundred thirty-one thousand, nine hundred thirteen".