636749213 has 2 divisors, whose sum is σ = 636749214. Its totient is φ = 636749212.

The previous prime is 636749177. The next prime is 636749249. The reversal of 636749213 is 312947636.

636749213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (636749177) and next prime (636749249).

It can be written as a sum of positive squares in only one way, i.e., 539075524 + 97673689 = 23218^2 + 9883^2 .

It is a cyclic number.

It is not a de Polignac number, because 636749213 - 2⁶ = 636749149 is a prime.

It is a super-2 number, since 2×636749213² = 810899120512238738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636746213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318374606 + 318374607.

It is an arithmetic number, because the mean of its divisors is an integer number (318374607).

Almost surely, 2^636749213 is an apocalyptic number.

It is an amenable number.

636749213 is a deficient number, since it is larger than the sum of its proper divisors (1).

636749213 is an equidigital number, since it uses as much as digits as its factorization.

636749213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 41.

The square root of 636749213 is about 25233.8901677882. The cubic root of 636749213 is about 860.3123135555.

The spelling of 636749213 in words is "six hundred thirty-six million, seven hundred forty-nine thousand, two hundred thirteen".