1642203217 has 4 divisors (see below), whose sum is σ = 1682256996. Its totient is φ = 1602149440.

The previous prime is 1642203203. The next prime is 1642203221. The reversal of 1642203217 is 7123022461.

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 235653201 + 1406550016 = 15351^2 + 37504^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642203217 - 2¹⁵ = 1642170449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642203287) 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, 20026828 + ... + 20026909.

It is an arithmetic number, because the mean of its divisors is an integer number (420564249).

Almost surely, 2^1642203217 is an apocalyptic number.

It is an amenable number.

1642203217 is a deficient number, since it is larger than the sum of its proper divisors (40053779).

1642203217 is an equidigital number, since it uses as much as digits as its factorization.

1642203217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40053778.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1642203217 is about 40524.1066156923. The cubic root of 1642203217 is about 1179.8015602817.

Adding to 1642203217 its reverse (7123022461), we get a palindrome (8765225678).

The spelling of 1642203217 in words is "one billion, six hundred forty-two million, two hundred three thousand, two hundred seventeen".