642243359 has 2 divisors, whose sum is σ = 642243360. Its totient is φ = 642243358.

The previous prime is 642243331. The next prime is 642243361. The reversal of 642243359 is 953342246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642243359 - 2¹² = 642239263 is a prime.

It is a Sophie Germain prime.

Together with 642243361, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642243389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321121679 + 321121680.

It is an arithmetic number, because the mean of its divisors is an integer number (321121680).

Almost surely, 2^642243359 is an apocalyptic number.

642243359 is a deficient number, since it is larger than the sum of its proper divisors (1).

642243359 is an equidigital number, since it uses as much as digits as its factorization.

642243359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 38.

The square root of 642243359 is about 25342.5207704364. The cubic root of 642243359 is about 862.7796123188.

The spelling of 642243359 in words is "six hundred forty-two million, two hundred forty-three thousand, three hundred fifty-nine".