642303247 has 2 divisors, whose sum is σ = 642303248. Its totient is φ = 642303246.

The previous prime is 642303241. The next prime is 642303257. The reversal of 642303247 is 742303246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642303247 - 2⁷ = 642303119 is a prime.

It is a super-2 number, since 2×642303247² = 825106922213486018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642303241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321151623 + 321151624.

It is an arithmetic number, because the mean of its divisors is an integer number (321151624).

Almost surely, 2^642303247 is an apocalyptic number.

642303247 is a deficient number, since it is larger than the sum of its proper divisors (1).

642303247 is an equidigital number, since it uses as much as digits as its factorization.

642303247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 31.

The square root of 642303247 is about 25343.7023143818. The cubic root of 642303247 is about 862.8064290172.

Subtracting 642303247 from its reverse (742303246), we obtain a palindrome (99999999).

The spelling of 642303247 in words is "six hundred forty-two million, three hundred three thousand, two hundred forty-seven".