642345211 has 4 divisors (see below), whose sum is σ = 643498992. Its totient is φ = 641191432.

The previous prime is 642345181. The next prime is 642345241. The reversal of 642345211 is 112543246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112543246 = 2 ⋅56271623.

It is an interprime number because it is at equal distance from previous prime (642345181) and next prime (642345241).

It is a cyclic number.

It is not a de Polignac number, because 642345211 - 2⁷ = 642345083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642345211.

It is not an unprimeable number, because it can be changed into a prime (642345241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576055 + ... + 577168.

It is an arithmetic number, because the mean of its divisors is an integer number (160874748).

Almost surely, 2^642345211 is an apocalyptic number.

642345211 is a deficient number, since it is larger than the sum of its proper divisors (1153781).

642345211 is a wasteful number, since it uses less digits than its factorization.

642345211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153780.

The product of its digits is 5760, while the sum is 28.

The square root of 642345211 is about 25344.5301988417. The cubic root of 642345211 is about 862.8252186988.

Adding to 642345211 its reverse (112543246), we get a palindrome (754888457).

The spelling of 642345211 in words is "six hundred forty-two million, three hundred forty-five thousand, two hundred eleven".