646224101 has 4 divisors (see below), whose sum is σ = 648302304. Its totient is φ = 644145900.

The previous prime is 646224097. The next prime is 646224107. The reversal of 646224101 is 101422646.

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 646224101 - 2² = 646224097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646224107) 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 in 3 ways as a sum of consecutive naturals, for example, 1038635 + ... + 1039256.

It is an arithmetic number, because the mean of its divisors is an integer number (162075576).

Almost surely, 2^646224101 is an apocalyptic number.

It is an amenable number.

646224101 is a deficient number, since it is larger than the sum of its proper divisors (2078203).

646224101 is a wasteful number, since it uses less digits than its factorization.

646224101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078202.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 646224101 is about 25420.9382399627. The cubic root of 646224101 is about 864.5584974471.

Adding to 646224101 its reverse (101422646), we get a palindrome (747646747).

The spelling of 646224101 in words is "six hundred forty-six million, two hundred twenty-four thousand, one hundred one".