642219271 has 4 divisors (see below), whose sum is σ = 670141872. Its totient is φ = 614296672.

The previous prime is 642219257. The next prime is 642219289. The reversal of 642219271 is 172912246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642219271 - 2²⁹ = 105348359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642219241) 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, 13961266 + ... + 13961311.

It is an arithmetic number, because the mean of its divisors is an integer number (167535468).

Almost surely, 2^642219271 is an apocalyptic number.

642219271 is a deficient number, since it is larger than the sum of its proper divisors (27922601).

642219271 is a wasteful number, since it uses less digits than its factorization.

642219271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27922600.

The product of its digits is 12096, while the sum is 34.

The square root of 642219271 is about 25342.0455172821. The cubic root of 642219271 is about 862.7688257040.

The spelling of 642219271 in words is "six hundred forty-two million, two hundred nineteen thousand, two hundred seventy-one".