631881881951 has 2 divisors, whose sum is σ = 631881881952. Its totient is φ = 631881881950.

The previous prime is 631881881921. The next prime is 631881881971. The reversal of 631881881951 is 159188188136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631881881951 - 2⁶ = 631881881887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631881881921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315940940975 + 315940940976.

It is an arithmetic number, because the mean of its divisors is an integer number (315940940976).

Almost surely, 2^631881881951 is an apocalyptic number.

631881881951 is a deficient number, since it is larger than the sum of its proper divisors (1).

631881881951 is an equidigital number, since it uses as much as digits as its factorization.

631881881951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3317760, while the sum is 59.

The spelling of 631881881951 in words is "six hundred thirty-one billion, eight hundred eighty-one million, eight hundred eighty-one thousand, nine hundred fifty-one".