631138259 has 2 divisors, whose sum is σ = 631138260. Its totient is φ = 631138258.

The previous prime is 631138247. The next prime is 631138279. The reversal of 631138259 is 952831136.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631138259 - 2¹⁶ = 631072723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631138229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315569129 + 315569130.

It is an arithmetic number, because the mean of its divisors is an integer number (315569130).

Almost surely, 2^631138259 is an apocalyptic number.

631138259 is a deficient number, since it is larger than the sum of its proper divisors (1).

631138259 is an equidigital number, since it uses as much as digits as its factorization.

631138259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 631138259 is about 25122.4652253715. The cubic root of 631138259 is about 857.7778665267. Note that the first 3 decimals are identical.

The spelling of 631138259 in words is "six hundred thirty-one million, one hundred thirty-eight thousand, two hundred fifty-nine".