636149 has 2 divisors, whose sum is σ = 636150. Its totient is φ = 636148.

The previous prime is 636137. The next prime is 636193. The reversal of 636149 is 941636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552049 + 84100 = 743^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 636149 - 2⁴ = 636133 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318074 + 318075.

It is an arithmetic number, because the mean of its divisors is an integer number (318075).

2⁶³⁶¹⁴⁹ is an apocalyptic number.

It is an amenable number.

636149 is a deficient number, since it is larger than the sum of its proper divisors (1).

636149 is an equidigital number, since it uses as much as digits as its factorization.

636149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 636149 is about 797.5894934112. The cubic root of 636149 is about 86.0041912506.

The spelling of 636149 in words is "six hundred thirty-six thousand, one hundred forty-nine".