631611853 has 2 divisors, whose sum is σ = 631611854. Its totient is φ = 631611852.

The previous prime is 631611839. The next prime is 631611859. The reversal of 631611853 is 358116136.

631611853 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 can be written as a sum of positive squares in only one way, i.e., 570349924 + 61261929 = 23882^2 + 7827^2 .

It is a cyclic number.

It is not a de Polignac number, because 631611853 - 2²¹ = 629514701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631611859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315805926 + 315805927.

It is an arithmetic number, because the mean of its divisors is an integer number (315805927).

Almost surely, 2^631611853 is an apocalyptic number.

It is an amenable number.

631611853 is a deficient number, since it is larger than the sum of its proper divisors (1).

631611853 is an equidigital number, since it uses as much as digits as its factorization.

631611853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 631611853 is about 25131.8891649633. The cubic root of 631611853 is about 857.9923662164.

Adding to 631611853 its reverse (358116136), we get a palindrome (989727989).

The spelling of 631611853 in words is "six hundred thirty-one million, six hundred eleven thousand, eight hundred fifty-three".