642222619 has 4 divisors (see below), whose sum is σ = 651268080. Its totient is φ = 633177160.

The previous prime is 642222601. The next prime is 642222643. The reversal of 642222619 is 916222246.

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 642222619 - 2²³ = 633834011 is a prime.

It is a super-2 number, since 2×642222619² = 824899784710438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642222019) 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, 4522624 + ... + 4522765.

It is an arithmetic number, because the mean of its divisors is an integer number (162817020).

Almost surely, 2^642222619 is an apocalyptic number.

642222619 is a deficient number, since it is larger than the sum of its proper divisors (9045461).

642222619 is an equidigital number, since it uses as much as digits as its factorization.

642222619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045460.

The product of its digits is 20736, while the sum is 34.

The square root of 642222619 is about 25342.1115734266. Note that the first 3 decimals coincide. The cubic root of 642222619 is about 862.7703249557.

The spelling of 642222619 in words is "six hundred forty-two million, two hundred twenty-two thousand, six hundred nineteen".