642369983 has 2 divisors, whose sum is σ = 642369984. Its totient is φ = 642369982.

The previous prime is 642369971. The next prime is 642370019. The reversal of 642369983 is 389963246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642369983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642369943) 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, 321184991 + 321184992.

It is an arithmetic number, because the mean of its divisors is an integer number (321184992).

Almost surely, 2^642369983 is an apocalyptic number.

642369983 is a deficient number, since it is larger than the sum of its proper divisors (1).

642369983 is an equidigital number, since it uses as much as digits as its factorization.

642369983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 50.

The square root of 642369983 is about 25345.0188991841. The cubic root of 642369983 is about 862.8363101551.

The spelling of 642369983 in words is "six hundred forty-two million, three hundred sixty-nine thousand, nine hundred eighty-three".