631619257 has 2 divisors, whose sum is σ = 631619258. Its totient is φ = 631619256.

The previous prime is 631619231. The next prime is 631619269. The reversal of 631619257 is 752916136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391090176 + 240529081 = 19776^2 + 15509^2 .

It is a cyclic number.

It is not a de Polignac number, because 631619257 - 2⁷ = 631619129 is a prime.

It is not a weakly prime, because it can be changed into another prime (631619657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315809628 + 315809629.

It is an arithmetic number, because the mean of its divisors is an integer number (315809629).

Almost surely, 2^631619257 is an apocalyptic number.

It is an amenable number.

631619257 is a deficient number, since it is larger than the sum of its proper divisors (1).

631619257 is an equidigital number, since it uses as much as digits as its factorization.

631619257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 631619257 is about 25132.0364674254. The cubic root of 631619257 is about 857.9957187768.

The spelling of 631619257 in words is "six hundred thirty-one million, six hundred nineteen thousand, two hundred fifty-seven".