646222441 has 4 divisors (see below), whose sum is σ = 648555652. Its totient is φ = 643889232.

The previous prime is 646222417. The next prime is 646222453. The reversal of 646222441 is 144222646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90630400 + 555592041 = 9520^2 + 23571^2 .

It is a cyclic number.

It is not a de Polignac number, because 646222441 - 2¹³ = 646214249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646222141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166190 + ... + 1166743.

It is an arithmetic number, because the mean of its divisors is an integer number (162138913).

Almost surely, 2^646222441 is an apocalyptic number.

It is an amenable number.

646222441 is a deficient number, since it is larger than the sum of its proper divisors (2333211).

646222441 is a wasteful number, since it uses less digits than its factorization.

646222441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333210.

The product of its digits is 18432, while the sum is 31.

The square root of 646222441 is about 25420.9055896913. The cubic root of 646222441 is about 864.5577571629.

The spelling of 646222441 in words is "six hundred forty-six million, two hundred twenty-two thousand, four hundred forty-one".