631006432421 has 2 divisors, whose sum is σ = 631006432422. Its totient is φ = 631006432420.

The previous prime is 631006432219. The next prime is 631006432423. The reversal of 631006432421 is 124234600136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361635052321 + 269371380100 = 601361^2 + 519010^2 .

It is a cyclic number.

It is not a de Polignac number, because 631006432421 - 2¹⁴ = 631006416037 is a prime.

Together with 631006432423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631006432423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315503216210 + 315503216211.

It is an arithmetic number, because the mean of its divisors is an integer number (315503216211).

Almost surely, 2^631006432421 is an apocalyptic number.

It is an amenable number.

631006432421 is a deficient number, since it is larger than the sum of its proper divisors (1).

631006432421 is an equidigital number, since it uses as much as digits as its factorization.

631006432421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 631006432421 in words is "six hundred thirty-one billion, six million, four hundred thirty-two thousand, four hundred twenty-one".