631667 has 2 divisors, whose sum is σ = 631668. Its totient is φ = 631666.

The previous prime is 631643. The next prime is 631679. The reversal of 631667 is 766136.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631667 - 2¹⁶ = 566131 is a prime.

It is not a weakly prime, because it can be changed into another prime (631867) 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, 315833 + 315834.

It is an arithmetic number, because the mean of its divisors is an integer number (315834).

2⁶³¹⁶⁶⁷ is an apocalyptic number.

631667 is a deficient number, since it is larger than the sum of its proper divisors (1).

631667 is an equidigital number, since it uses as much as digits as its factorization.

631667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 631667 is about 794.7748108741. The cubic root of 631667 is about 85.8017336366.

The spelling of 631667 in words is "six hundred thirty-one thousand, six hundred sixty-seven".