642211 has 2 divisors, whose sum is σ = 642212. Its totient is φ = 642210.

The previous prime is 642199. The next prime is 642217. The reversal of 642211 is 112246.

642211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642211 - 2¹¹ = 640163 is a prime.

It is an Ulam number.

642211 is a lucky number.

It is a nialpdrome in base 10 and base 15.

It is not a weakly prime, because it can be changed into another prime (642217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321105 + 321106.

It is an arithmetic number, because the mean of its divisors is an integer number (321106).

2⁶⁴²²¹¹ is an apocalyptic number.

642211 is a deficient number, since it is larger than the sum of its proper divisors (1).

642211 is an equidigital number, since it uses as much as digits as its factorization.

642211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 642211 is about 801.3806835705. The cubic root of 642211 is about 86.2765121885.

Adding to 642211 its reverse (112246), we get a palindrome (754457).

The spelling of 642211 in words is "six hundred forty-two thousand, two hundred eleven".