631889 has 2 divisors, whose sum is σ = 631890. Its totient is φ = 631888.

The previous prime is 631867. The next prime is 631901. The reversal of 631889 is 988136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 54289 = 760^2 + 233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631889 is a prime.

It is not a weakly prime, because it can be changed into another prime (631819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315944 + 315945.

It is an arithmetic number, because the mean of its divisors is an integer number (315945).

2⁶³¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

631889 is a deficient number, since it is larger than the sum of its proper divisors (1).

631889 is an equidigital number, since it uses as much as digits as its factorization.

631889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 631889 is about 794.9144608069. The cubic root of 631889 is about 85.8117841611.

The spelling of 631889 in words is "six hundred thirty-one thousand, eight hundred eighty-nine".