636135091 has 2 divisors, whose sum is σ = 636135092. Its totient is φ = 636135090.

The previous prime is 636135037. The next prime is 636135103. The reversal of 636135091 is 190531636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 636135091 - 2⁷ = 636134963 is a prime.

It is not a weakly prime, because it can be changed into another prime (636135001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318067545 + 318067546.

It is an arithmetic number, because the mean of its divisors is an integer number (318067546).

Almost surely, 2^636135091 is an apocalyptic number.

636135091 is a deficient number, since it is larger than the sum of its proper divisors (1).

636135091 is an equidigital number, since it uses as much as digits as its factorization.

636135091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 636135091 is about 25221.7186369208. The cubic root of 636135091 is about 860.0356443672.

The spelling of 636135091 in words is "six hundred thirty-six million, one hundred thirty-five thousand, ninety-one".