636901 has 8 divisors (see below), whose sum is σ = 662904. Its totient is φ = 611520.

The previous prime is 636877. The next prime is 636917. The reversal of 636901 is 109636.

It can be written as a sum of positive squares in 4 ways, for example, as 160801 + 476100 = 401^2 + 690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 636901 - 2⁷ = 636773 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3135 + ... + 3331.

It is an arithmetic number, because the mean of its divisors is an integer number (82863).

2⁶³⁶⁹⁰¹ is an apocalyptic number.

636901 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

636901 is a deficient number, since it is larger than the sum of its proper divisors (26003).

636901 is a wasteful number, since it uses less digits than its factorization.

636901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 636901 is about 798.0607746281. The cubic root of 636901 is about 86.0380667966.

The spelling of 636901 in words is "six hundred thirty-six thousand, nine hundred one".