631961963 has 2 divisors, whose sum is σ = 631961964. Its totient is φ = 631961962.

The previous prime is 631961933. The next prime is 631961977. The reversal of 631961963 is 369169136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631961963 - 2⁶ = 631961899 is a prime.

It is not a weakly prime, because it can be changed into another prime (631961903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315980981 + 315980982.

It is an arithmetic number, because the mean of its divisors is an integer number (315980982).

Almost surely, 2^631961963 is an apocalyptic number.

631961963 is a deficient number, since it is larger than the sum of its proper divisors (1).

631961963 is an equidigital number, since it uses as much as digits as its factorization.

631961963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 631961963 is about 25138.8536532595. The cubic root of 631961963 is about 858.1508687416.

The spelling of 631961963 in words is "six hundred thirty-one million, nine hundred sixty-one thousand, nine hundred sixty-three".