642233 has 2 divisors, whose sum is σ = 642234. Its totient is φ = 642232.

The previous prime is 642223. The next prime is 642241. The reversal of 642233 is 332246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565504 + 76729 = 752^2 + 277^2 .

It is a cyclic number.

It is not a de Polignac number, because 642233 - 2⁴ = 642217 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (642223) 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 as a sum of consecutive naturals, namely, 321116 + 321117.

It is an arithmetic number, because the mean of its divisors is an integer number (321117).

2⁶⁴²²³³ is an apocalyptic number.

It is an amenable number.

642233 is a deficient number, since it is larger than the sum of its proper divisors (1).

642233 is an equidigital number, since it uses as much as digits as its factorization.

642233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 20.

The square root of 642233 is about 801.3944097634. The cubic root of 642233 is about 86.2774973588.

Adding to 642233 its reverse (332246), we get a palindrome (974479).

The spelling of 642233 in words is "six hundred forty-two thousand, two hundred thirty-three".