631623133 has 2 divisors, whose sum is σ = 631623134. Its totient is φ = 631623132.

The previous prime is 631623131. The next prime is 631623149. The reversal of 631623133 is 331326136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621106084 + 10517049 = 24922^2 + 3243^2 .

It is a cyclic number.

It is not a de Polignac number, because 631623133 - 2¹ = 631623131 is a prime.

Together with 631623131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631623131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315811566 + 315811567.

It is an arithmetic number, because the mean of its divisors is an integer number (315811567).

Almost surely, 2^631623133 is an apocalyptic number.

It is an amenable number.

631623133 is a deficient number, since it is larger than the sum of its proper divisors (1).

631623133 is an equidigital number, since it uses as much as digits as its factorization.

631623133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 28.

The square root of 631623133 is about 25132.1135800394. The cubic root of 631623133 is about 857.9974738344.

Adding to 631623133 its reverse (331326136), we get a palindrome (962949269).

The spelling of 631623133 in words is "six hundred thirty-one million, six hundred twenty-three thousand, one hundred thirty-three".