636321349 has 2 divisors, whose sum is σ = 636321350. Its totient is φ = 636321348.

The previous prime is 636321347. The next prime is 636321359. The reversal of 636321349 is 943123636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627853249 + 8468100 = 25057^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 636321349 - 2¹ = 636321347 is a prime.

Together with 636321347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636321347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318160674 + 318160675.

It is an arithmetic number, because the mean of its divisors is an integer number (318160675).

Almost surely, 2^636321349 is an apocalyptic number.

It is an amenable number.

636321349 is a deficient number, since it is larger than the sum of its proper divisors (1).

636321349 is an equidigital number, since it uses as much as digits as its factorization.

636321349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 37.

The square root of 636321349 is about 25225.4107796087. The cubic root of 636321349 is about 860.1195745940.

The spelling of 636321349 in words is "six hundred thirty-six million, three hundred twenty-one thousand, three hundred forty-nine".