631247 has 2 divisors, whose sum is σ = 631248. Its totient is φ = 631246.

The previous prime is 631229. The next prime is 631249. The reversal of 631247 is 742136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631247 - 2¹⁴ = 614863 is a prime.

Together with 631249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315623 + 315624.

It is an arithmetic number, because the mean of its divisors is an integer number (315624).

2⁶³¹²⁴⁷ is an apocalyptic number.

631247 is a deficient number, since it is larger than the sum of its proper divisors (1).

631247 is an equidigital number, since it uses as much as digits as its factorization.

631247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 631247 is about 794.5105411510. The cubic root of 631247 is about 85.7827126872.

Subtracting 631247 from its reverse (742136), we obtain a square (110889 = 333²).

It can be divided in two parts, 631 and 247, that added together give a palindrome (878).

The spelling of 631247 in words is "six hundred thirty-one thousand, two hundred forty-seven".