646032199 has 2 divisors, whose sum is σ = 646032200. Its totient is φ = 646032198.

The previous prime is 646032197. The next prime is 646032223. The reversal of 646032199 is 991230646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646032199 - 2¹ = 646032197 is a prime.

Together with 646032197, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646032197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323016099 + 323016100.

It is an arithmetic number, because the mean of its divisors is an integer number (323016100).

Almost surely, 2^646032199 is an apocalyptic number.

646032199 is a deficient number, since it is larger than the sum of its proper divisors (1).

646032199 is an equidigital number, since it uses as much as digits as its factorization.

646032199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 646032199 is about 25417.1634727402. The cubic root of 646032199 is about 864.4729095269.

The spelling of 646032199 in words is "six hundred forty-six million, thirty-two thousand, one hundred ninety-nine".