642432211 has 8 divisors (see below), whose sum is σ = 652355424. Its totient is φ = 632533440.

The previous prime is 642432163. The next prime is 642432257. The reversal of 642432211 is 112234246.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 642432211 - 2²³ = 634043603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642432281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50911 + ... + 62263.

It is an arithmetic number, because the mean of its divisors is an integer number (81544428).

Almost surely, 2^642432211 is an apocalyptic number.

642432211 is a deficient number, since it is larger than the sum of its proper divisors (9923213).

642432211 is a wasteful number, since it uses less digits than its factorization.

642432211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12221.

The product of its digits is 2304, while the sum is 25.

The square root of 642432211 is about 25346.2464873993. The cubic root of 642432211 is about 862.8641709652.

Adding to 642432211 its reverse (112234246), we get a palindrome (754666457).

The spelling of 642432211 in words is "six hundred forty-two million, four hundred thirty-two thousand, two hundred eleven".