636331 has 2 divisors, whose sum is σ = 636332. Its totient is φ = 636330.

The previous prime is 636319. The next prime is 636343. The reversal of 636331 is 133636.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (636319) and next prime (636343).

It is a cyclic number.

It is not a de Polignac number, because 636331 - 2¹³ = 628139 is a prime.

It is a super-2 number, since 2×636331² = 809834283122, which contains 22 as substring.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (636301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318165 + 318166.

It is an arithmetic number, because the mean of its divisors is an integer number (318166).

2⁶³⁶³³¹ is an apocalyptic number.

636331 is a deficient number, since it is larger than the sum of its proper divisors (1).

636331 is an equidigital number, since it uses as much as digits as its factorization.

636331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 22.

The square root of 636331 is about 797.7035790317. The cubic root of 636331 is about 86.0123923011.

Adding to 636331 its reverse (133636), we get a palindrome (769967).

The spelling of 636331 in words is "six hundred thirty-six thousand, three hundred thirty-one".