631240459 has 2 divisors, whose sum is σ = 631240460. Its totient is φ = 631240458.

The previous prime is 631240391. The next prime is 631240499. The reversal of 631240459 is 954042136.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631240459 - 2¹³ = 631232267 is a prime.

It is not a weakly prime, because it can be changed into another prime (631240499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315620229 + 315620230.

It is an arithmetic number, because the mean of its divisors is an integer number (315620230).

Almost surely, 2^631240459 is an apocalyptic number.

631240459 is a deficient number, since it is larger than the sum of its proper divisors (1).

631240459 is an equidigital number, since it uses as much as digits as its factorization.

631240459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 631240459 is about 25124.4991790881. The cubic root of 631240459 is about 857.8241639189.

The spelling of 631240459 in words is "six hundred thirty-one million, two hundred forty thousand, four hundred fifty-nine".