633636397 has 2 divisors, whose sum is σ = 633636398. Its totient is φ = 633636396.

The previous prime is 633636391. The next prime is 633636431. The reversal of 633636397 is 793636336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467381161 + 166255236 = 21619^2 + 12894^2 .

It is a cyclic number.

It is not a de Polignac number, because 633636397 - 2²³ = 625247789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633636391) 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 as a sum of consecutive naturals, namely, 316818198 + 316818199.

It is an arithmetic number, because the mean of its divisors is an integer number (316818199).

Almost surely, 2^633636397 is an apocalyptic number.

It is an amenable number.

633636397 is a deficient number, since it is larger than the sum of its proper divisors (1).

633636397 is an equidigital number, since it uses as much as digits as its factorization.

633636397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 46.

The square root of 633636397 is about 25172.1353285731. The cubic root of 633636397 is about 858.9081135679.

The spelling of 633636397 in words is "six hundred thirty-three million, six hundred thirty-six thousand, three hundred ninety-seven".