631307387 has 2 divisors, whose sum is σ = 631307388. Its totient is φ = 631307386.

The previous prime is 631307329. The next prime is 631307389. The reversal of 631307387 is 783703136.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631307387 - 2¹⁰ = 631306363 is a prime.

Together with 631307389, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631307387.

It is not a weakly prime, because it can be changed into another prime (631307389) 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, 315653693 + 315653694.

It is an arithmetic number, because the mean of its divisors is an integer number (315653694).

Almost surely, 2^631307387 is an apocalyptic number.

631307387 is a deficient number, since it is larger than the sum of its proper divisors (1).

631307387 is an equidigital number, since it uses as much as digits as its factorization.

631307387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 631307387 is about 25125.8310708323. The cubic root of 631307387 is about 857.8544801140.

The spelling of 631307387 in words is "six hundred thirty-one million, three hundred seven thousand, three hundred eighty-seven".