642341279 has 2 divisors, whose sum is σ = 642341280. Its totient is φ = 642341278.

The previous prime is 642341239. The next prime is 642341299. The reversal of 642341279 is 972143246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642341279 - 2⁸ = 642341023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642341239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321170639 + 321170640.

It is an arithmetic number, because the mean of its divisors is an integer number (321170640).

Almost surely, 2^642341279 is an apocalyptic number.

642341279 is a deficient number, since it is larger than the sum of its proper divisors (1).

642341279 is an equidigital number, since it uses as much as digits as its factorization.

642341279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 642341279 is about 25344.4526277448. The cubic root of 642341279 is about 862.8234581524.

The spelling of 642341279 in words is "six hundred forty-two million, three hundred forty-one thousand, two hundred seventy-nine".