1643216122 has 8 divisors (see below), whose sum is σ = 2524941972. Its totient is φ = 801568800.

The previous prime is 1643216087. The next prime is 1643216131. The reversal of 1643216122 is 2216123461.

It can be written as a sum of positive squares in 2 ways, for example, as 1039482081 + 603734041 = 32241^2 + 24571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10019529 + ... + 10019692.

Almost surely, 2^1643216122 is an apocalyptic number.

1643216122 is a deficient number, since it is larger than the sum of its proper divisors (881725850).

1643216122 is a wasteful number, since it uses less digits than its factorization.

1643216122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20039264.

The product of its digits is 3456, while the sum is 28.

The square root of 1643216122 is about 40536.6022503120. The cubic root of 1643216122 is about 1180.0440762048.

Adding to 1643216122 its reverse (2216123461), we get a palindrome (3859339583).

The spelling of 1643216122 in words is "one billion, six hundred forty-three million, two hundred sixteen thousand, one hundred twenty-two".