631448861 has 2 divisors, whose sum is σ = 631448862. Its totient is φ = 631448860.

The previous prime is 631448801. The next prime is 631448863. The reversal of 631448861 is 168844136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372721636 + 258727225 = 19306^2 + 16085^2 .

It is a cyclic number.

It is not a de Polignac number, because 631448861 - 2¹⁰ = 631447837 is a prime.

Together with 631448863, 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 (631448863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315724430 + 315724431.

It is an arithmetic number, because the mean of its divisors is an integer number (315724431).

Almost surely, 2^631448861 is an apocalyptic number.

It is an amenable number.

631448861 is a deficient number, since it is larger than the sum of its proper divisors (1).

631448861 is an equidigital number, since it uses as much as digits as its factorization.

631448861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The square root of 631448861 is about 25128.6462229862. The cubic root of 631448861 is about 857.9185561582.

The spelling of 631448861 in words is "six hundred thirty-one million, four hundred forty-eight thousand, eight hundred sixty-one".