636134893 has 2 divisors, whose sum is σ = 636134894. Its totient is φ = 636134892.

The previous prime is 636134869. The next prime is 636134899. The reversal of 636134893 is 398431636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505215529 + 130919364 = 22477^2 + 11442^2 .

It is a cyclic number.

It is not a de Polignac number, because 636134893 - 2⁵ = 636134861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636134899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318067446 + 318067447.

It is an arithmetic number, because the mean of its divisors is an integer number (318067447).

Almost surely, 2^636134893 is an apocalyptic number.

It is an amenable number.

636134893 is a deficient number, since it is larger than the sum of its proper divisors (1).

636134893 is an equidigital number, since it uses as much as digits as its factorization.

636134893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 43.

The square root of 636134893 is about 25221.7147117320. The cubic root of 636134893 is about 860.0355551372.

The spelling of 636134893 in words is "six hundred thirty-six million, one hundred thirty-four thousand, eight hundred ninety-three".