636244157 has 2 divisors, whose sum is σ = 636244158. Its totient is φ = 636244156.

The previous prime is 636244153. The next prime is 636244163. The reversal of 636244157 is 751442636.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635594521 + 649636 = 25211^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 636244157 - 2² = 636244153 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 636244157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636244151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318122078 + 318122079.

It is an arithmetic number, because the mean of its divisors is an integer number (318122079).

Almost surely, 2^636244157 is an apocalyptic number.

It is an amenable number.

636244157 is a deficient number, since it is larger than the sum of its proper divisors (1).

636244157 is an equidigital number, since it uses as much as digits as its factorization.

636244157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 636244157 is about 25223.8806887441. The cubic root of 636244157 is about 860.0847928834.

The spelling of 636244157 in words is "six hundred thirty-six million, two hundred forty-four thousand, one hundred fifty-seven".