642381937 has 2 divisors, whose sum is σ = 642381938. Its totient is φ = 642381936.

The previous prime is 642381899. The next prime is 642381991. The reversal of 642381937 is 739183246.

642381937 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547981281 + 94400656 = 23409^2 + 9716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642381937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642381893 and 642381902.

It is not a weakly prime, because it can be changed into another prime (642381437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321190968 + 321190969.

It is an arithmetic number, because the mean of its divisors is an integer number (321190969).

Almost surely, 2^642381937 is an apocalyptic number.

It is an amenable number.

642381937 is a deficient number, since it is larger than the sum of its proper divisors (1).

642381937 is an equidigital number, since it uses as much as digits as its factorization.

642381937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 642381937 is about 25345.2547235178. The cubic root of 642381937 is about 862.8416623569.

The spelling of 642381937 in words is "six hundred forty-two million, three hundred eighty-one thousand, nine hundred thirty-seven".