842403109 has 2 divisors, whose sum is σ = 842403110. Its totient is φ = 842403108.

The previous prime is 842403059. The next prime is 842403139. The reversal of 842403109 is 901304248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819218884 + 23184225 = 28622^2 + 4815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842403109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842403139) 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, 421201554 + 421201555.

It is an arithmetic number, because the mean of its divisors is an integer number (421201555).

Almost surely, 2^842403109 is an apocalyptic number.

It is an amenable number.

842403109 is a deficient number, since it is larger than the sum of its proper divisors (1).

842403109 is an equidigital number, since it uses as much as digits as its factorization.

842403109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 842403109 is about 29024.1814527128. The cubic root of 842403109 is about 944.4377118377.

The spelling of 842403109 in words is "eight hundred forty-two million, four hundred three thousand, one hundred nine".