631139 has 2 divisors, whose sum is σ = 631140. Its totient is φ = 631138.

The previous prime is 631133. The next prime is 631151. The reversal of 631139 is 931136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631139 - 2¹⁶ = 565603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315569 + 315570.

It is an arithmetic number, because the mean of its divisors is an integer number (315570).

2⁶³¹¹³⁹ is an apocalyptic number.

631139 is a deficient number, since it is larger than the sum of its proper divisors (1).

631139 is an equidigital number, since it uses as much as digits as its factorization.

631139 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 631139 is about 794.4425718704. The cubic root of 631139 is about 85.7778202223. Note that the first 3 decimals are identical.

The spelling of 631139 in words is "six hundred thirty-one thousand, one hundred thirty-nine".