631637958071 has 2 divisors, whose sum is σ = 631637958072. Its totient is φ = 631637958070.

The previous prime is 631637958041. The next prime is 631637958073. The reversal of 631637958071 is 170859736136.

631637958071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631637958071 - 2¹⁰ = 631637957047 is a prime.

It is a super-2 number, since 2×631637958071² (a number of 24 digits) contains 22 as substring.

Together with 631637958073, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 631637957998 and 631637958016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631637958073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315818979035 + 315818979036.

It is an arithmetic number, because the mean of its divisors is an integer number (315818979036).

Almost surely, 2^631637958071 is an apocalyptic number.

631637958071 is a deficient number, since it is larger than the sum of its proper divisors (1).

631637958071 is an equidigital number, since it uses as much as digits as its factorization.

631637958071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 631637958071 in words is "six hundred thirty-one billion, six hundred thirty-seven million, nine hundred fifty-eight thousand, seventy-one".