642370019 has 2 divisors, whose sum is σ = 642370020. Its totient is φ = 642370018.

The previous prime is 642369983. The next prime is 642370037. The reversal of 642370019 is 910073246.

642370019 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 a de Polignac number, because none of the positive numbers 2^k-642370019 is a prime.

It is a super-2 number, since 2×642370019² = 825278482620120722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642370219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321185009 + 321185010.

It is an arithmetic number, because the mean of its divisors is an integer number (321185010).

Almost surely, 2^642370019 is an apocalyptic number.

642370019 is a deficient number, since it is larger than the sum of its proper divisors (1).

642370019 is an equidigital number, since it uses as much as digits as its factorization.

642370019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 642370019 is about 25345.0196093828. The cubic root of 642370019 is about 862.8363262736.

The spelling of 642370019 in words is "six hundred forty-two million, three hundred seventy thousand, nineteen".