642481243 has 2 divisors, whose sum is σ = 642481244. Its totient is φ = 642481242.

The previous prime is 642481183. The next prime is 642481253. The reversal of 642481243 is 342184246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642481243 - 2²¹ = 640384091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642481199 and 642481208.

It is not a weakly prime, because it can be changed into another prime (642481253) 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, 321240621 + 321240622.

It is an arithmetic number, because the mean of its divisors is an integer number (321240622).

Almost surely, 2^642481243 is an apocalyptic number.

642481243 is a deficient number, since it is larger than the sum of its proper divisors (1).

642481243 is an equidigital number, since it uses as much as digits as its factorization.

642481243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 34.

The square root of 642481243 is about 25347.2137127535. The cubic root of 642481243 is about 862.8861223758.

The spelling of 642481243 in words is "six hundred forty-two million, four hundred eighty-one thousand, two hundred forty-three".