631139623 has 2 divisors, whose sum is σ = 631139624. Its totient is φ = 631139622.

The previous prime is 631139617. The next prime is 631139653. The reversal of 631139623 is 326931136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631139623 - 2⁹ = 631139111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631139653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315569811 + 315569812.

It is an arithmetic number, because the mean of its divisors is an integer number (315569812).

Almost surely, 2^631139623 is an apocalyptic number.

631139623 is a deficient number, since it is larger than the sum of its proper divisors (1).

631139623 is an equidigital number, since it uses as much as digits as its factorization.

631139623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 34.

The square root of 631139623 is about 25122.4923723742. The cubic root of 631139623 is about 857.7784844622.

The spelling of 631139623 in words is "six hundred thirty-one million, one hundred thirty-nine thousand, six hundred twenty-three".