631121411 has 2 divisors, whose sum is σ = 631121412. Its totient is φ = 631121410.

The previous prime is 631121389. The next prime is 631121419. The reversal of 631121411 is 114121136.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631121411 is a prime.

It is not a weakly prime, because it can be changed into another prime (631121419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315560705 + 315560706.

It is an arithmetic number, because the mean of its divisors is an integer number (315560706).

Almost surely, 2^631121411 is an apocalyptic number.

631121411 is a deficient number, since it is larger than the sum of its proper divisors (1).

631121411 is an equidigital number, since it uses as much as digits as its factorization.

631121411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 631121411 is about 25122.1299057226. The cubic root of 631121411 is about 857.7702337723.

Adding to 631121411 its reverse (114121136), we get a palindrome (745242547).

The spelling of 631121411 in words is "six hundred thirty-one million, one hundred twenty-one thousand, four hundred eleven".