631648403 has 2 divisors, whose sum is σ = 631648404. Its totient is φ = 631648402.

The previous prime is 631648361. The next prime is 631648411. The reversal of 631648403 is 304846136.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631648403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (631648903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315824201 + 315824202.

It is an arithmetic number, because the mean of its divisors is an integer number (315824202).

Almost surely, 2^631648403 is an apocalyptic number.

631648403 is a deficient number, since it is larger than the sum of its proper divisors (1).

631648403 is an equidigital number, since it uses as much as digits as its factorization.

631648403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 631648403 is about 25132.6163182427. The cubic root of 631648403 is about 858.0089159460.

The spelling of 631648403 in words is "six hundred thirty-one million, six hundred forty-eight thousand, four hundred three".