636261 has 8 divisors (see below), whose sum is σ = 858240. Its totient is φ = 419232.

The previous prime is 636257. The next prime is 636263. The reversal of 636261 is 162636.

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

It is not a de Polignac number, because 636261 - 2² = 636257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (107280).

2⁶³⁶²⁶¹ is an apocalyptic number.

It is an amenable number.

636261 is a deficient number, since it is larger than the sum of its proper divisors (221979).

636261 is a wasteful number, since it uses less digits than its factorization.

636261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475.

The product of its digits is 1296, while the sum is 24.

The square root of 636261 is about 797.6597018779. The cubic root of 636261 is about 86.0092382360.

Adding to 636261 its reverse (162636), we get a palindrome (798897).

The spelling of 636261 in words is "six hundred thirty-six thousand, two hundred sixty-one".