636411749 has 2 divisors, whose sum is σ = 636411750. Its totient is φ = 636411748.

The previous prime is 636411733. The next prime is 636411781. The reversal of 636411749 is 947114636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444450724 + 191961025 = 21082^2 + 13855^2 .

It is a cyclic number.

It is not a de Polignac number, because 636411749 - 2⁴ = 636411733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636311749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318205874 + 318205875.

It is an arithmetic number, because the mean of its divisors is an integer number (318205875).

Almost surely, 2^636411749 is an apocalyptic number.

It is an amenable number.

636411749 is a deficient number, since it is larger than the sum of its proper divisors (1).

636411749 is an equidigital number, since it uses as much as digits as its factorization.

636411749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 636411749 is about 25227.2025599352. The cubic root of 636411749 is about 860.1603040818.

The spelling of 636411749 in words is "six hundred thirty-six million, four hundred eleven thousand, seven hundred forty-nine".