643222013 has 16 divisors (see below), whose sum is σ = 779051520. Its totient is φ = 518436096.

The previous prime is 643222009. The next prime is 643222051. The reversal of 643222013 is 310222346.

It is a cyclic number.

It is not a de Polignac number, because 643222013 - 2² = 643222009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643222013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643224013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204668 + ... + 207786.

It is an arithmetic number, because the mean of its divisors is an integer number (48690720).

Almost surely, 2^643222013 is an apocalyptic number.

It is an amenable number.

643222013 is a deficient number, since it is larger than the sum of its proper divisors (135829507).

643222013 is a wasteful number, since it uses less digits than its factorization.

643222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4876.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 643222013 is about 25361.8219574225. The cubic root of 643222013 is about 863.2176260343.

Adding to 643222013 its reverse (310222346), we get a palindrome (953444359).

The spelling of 643222013 in words is "six hundred forty-three million, two hundred twenty-two thousand, thirteen".