642554347 has 2 divisors, whose sum is σ = 642554348. Its totient is φ = 642554346.

The previous prime is 642554333. The next prime is 642554357. The reversal of 642554347 is 743455246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642554347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642554357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321277173 + 321277174.

It is an arithmetic number, because the mean of its divisors is an integer number (321277174).

Almost surely, 2^642554347 is an apocalyptic number.

642554347 is a deficient number, since it is larger than the sum of its proper divisors (1).

642554347 is an equidigital number, since it uses as much as digits as its factorization.

642554347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 40.

The square root of 642554347 is about 25348.6557237263. The cubic root of 642554347 is about 862.9188486410.

The spelling of 642554347 in words is "six hundred forty-two million, five hundred fifty-four thousand, three hundred forty-seven".