636997 has 2 divisors, whose sum is σ = 636998. Its totient is φ = 636996.

The previous prime is 636983. The next prime is 637001. The reversal of 636997 is 799636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 6561 = 794^2 + 81^2 .

636997 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318498 + 318499.

It is an arithmetic number, because the mean of its divisors is an integer number (318499).

2⁶³⁶⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

636997 is a deficient number, since it is larger than the sum of its proper divisors (1).

636997 is an equidigital number, since it uses as much as digits as its factorization.

636997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 636997 is about 798.1209181571. The cubic root of 636997 is about 86.0423894147.

The spelling of 636997 in words is "six hundred thirty-six thousand, nine hundred ninety-seven".