642853433 has 2 divisors, whose sum is σ = 642853434. Its totient is φ = 642853432.

The previous prime is 642853423. The next prime is 642853481. The reversal of 642853433 is 334358246.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393308224 + 249545209 = 19832^2 + 15797^2 .

It is a cyclic number.

It is not a de Polignac number, because 642853433 - 2¹⁰ = 642852409 is a prime.

It is not a weakly prime, because it can be changed into another prime (642853423) 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, 321426716 + 321426717.

It is an arithmetic number, because the mean of its divisors is an integer number (321426717).

Almost surely, 2^642853433 is an apocalyptic number.

It is an amenable number.

642853433 is a deficient number, since it is larger than the sum of its proper divisors (1).

642853433 is an equidigital number, since it uses as much as digits as its factorization.

642853433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 38.

The square root of 642853433 is about 25354.5544823805. The cubic root of 642853433 is about 863.0527137970.

The spelling of 642853433 in words is "six hundred forty-two million, eight hundred fifty-three thousand, four hundred thirty-three".