646136201 has 4 divisors (see below), whose sum is σ = 652409472. Its totient is φ = 639862932.

The previous prime is 646136167. The next prime is 646136203. The reversal of 646136201 is 102631646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646136201 - 2⁶ = 646136137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646136203) 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 3 ways as a sum of consecutive naturals, for example, 3136481 + ... + 3136686.

It is an arithmetic number, because the mean of its divisors is an integer number (163102368).

Almost surely, 2^646136201 is an apocalyptic number.

It is an amenable number.

646136201 is a deficient number, since it is larger than the sum of its proper divisors (6273271).

646136201 is a wasteful number, since it uses less digits than its factorization.

646136201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6273270.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 646136201 is about 25419.2092914001. The cubic root of 646136201 is about 864.5192963208.

Adding to 646136201 its reverse (102631646), we get a palindrome (748767847).

The spelling of 646136201 in words is "six hundred forty-six million, one hundred thirty-six thousand, two hundred one".