642430303 has 2 divisors, whose sum is σ = 642430304. Its totient is φ = 642430302.

The previous prime is 642430279. The next prime is 642430343. The reversal of 642430303 is 303034246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642430303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642430343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321215151 + 321215152.

It is an arithmetic number, because the mean of its divisors is an integer number (321215152).

Almost surely, 2^642430303 is an apocalyptic number.

642430303 is a deficient number, since it is larger than the sum of its proper divisors (1).

642430303 is an equidigital number, since it uses as much as digits as its factorization.

642430303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 642430303 is about 25346.2088486622. The cubic root of 642430303 is about 862.8633167394.

Adding to 642430303 its reverse (303034246), we get a palindrome (945464549).

The spelling of 642430303 in words is "six hundred forty-two million, four hundred thirty thousand, three hundred three".