636041749 has 4 divisors (see below), whose sum is σ = 726904864. Its totient is φ = 545178636.

The previous prime is 636041737. The next prime is 636041753. The reversal of 636041749 is 947140636.

636041749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 636041749 - 2¹⁹ = 635517461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636041759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45431547 + ... + 45431560.

It is an arithmetic number, because the mean of its divisors is an integer number (181726216).

Almost surely, 2^636041749 is an apocalyptic number.

It is an amenable number.

636041749 is a deficient number, since it is larger than the sum of its proper divisors (90863115).

636041749 is an equidigital number, since it uses as much as digits as its factorization.

636041749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90863114.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 636041749 is about 25219.8681400201. The cubic root of 636041749 is about 859.9935771109.

The spelling of 636041749 in words is "six hundred thirty-six million, forty-one thousand, seven hundred forty-nine".