636897413 has 2 divisors, whose sum is σ = 636897414. Its totient is φ = 636897412.

The previous prime is 636897407. The next prime is 636897427. The reversal of 636897413 is 314798636.

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., 495596644 + 141300769 = 22262^2 + 11887^2 .

It is a cyclic number.

It is not a de Polignac number, because 636897413 - 2²² = 632703109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636897433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318448706 + 318448707.

It is an arithmetic number, because the mean of its divisors is an integer number (318448707).

Almost surely, 2^636897413 is an apocalyptic number.

It is an amenable number.

636897413 is a deficient number, since it is larger than the sum of its proper divisors (1).

636897413 is an equidigital number, since it uses as much as digits as its factorization.

636897413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 636897413 is about 25236.8265239511. The cubic root of 636897413 is about 860.3790527531.

The spelling of 636897413 in words is "six hundred thirty-six million, eight hundred ninety-seven thousand, four hundred thirteen".