642268871 has 2 divisors, whose sum is σ = 642268872. Its totient is φ = 642268870.

The previous prime is 642268849. The next prime is 642268883. The reversal of 642268871 is 178862246.

642268871 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 642268871 - 2¹⁴ = 642252487 is a prime.

It is a super-2 number, since 2×642268871² = 825018605311229282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642268811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321134435 + 321134436.

It is an arithmetic number, because the mean of its divisors is an integer number (321134436).

Almost surely, 2^642268871 is an apocalyptic number.

642268871 is a deficient number, since it is larger than the sum of its proper divisors (1).

642268871 is an equidigital number, since it uses as much as digits as its factorization.

642268871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 44.

The square root of 642268871 is about 25343.0241092100. The cubic root of 642268871 is about 862.7910363071.

The spelling of 642268871 in words is "six hundred forty-two million, two hundred sixty-eight thousand, eight hundred seventy-one".