631598774221 has 2 divisors, whose sum is σ = 631598774222. Its totient is φ = 631598774220.

The previous prime is 631598774153. The next prime is 631598774227. The reversal of 631598774221 is 122477895136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619386314121 + 12212460100 = 787011^2 + 110510^2 .

It is a cyclic number.

It is not a de Polignac number, because 631598774221 - 2⁹ = 631598773709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631598774227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315799387110 + 315799387111.

It is an arithmetic number, because the mean of its divisors is an integer number (315799387111).

Almost surely, 2^631598774221 is an apocalyptic number.

It is an amenable number.

631598774221 is a deficient number, since it is larger than the sum of its proper divisors (1).

631598774221 is an equidigital number, since it uses as much as digits as its factorization.

631598774221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 631598774221 in words is "six hundred thirty-one billion, five hundred ninety-eight million, seven hundred seventy-four thousand, two hundred twenty-one".