1602406909 has 2 divisors, whose sum is σ = 1602406910. Its totient is φ = 1602406908.

The previous prime is 1602406889. The next prime is 1602406931. The reversal of 1602406909 is 9096042061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011430809 + 590976100 = 31803^2 + 24310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1602406909 - 2¹⁵ = 1602374141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1602406979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801203454 + 801203455.

It is an arithmetic number, because the mean of its divisors is an integer number (801203455).

Almost surely, 2^1602406909 is an apocalyptic number.

It is an amenable number.

1602406909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1602406909 is an equidigital number, since it uses as much as digits as its factorization.

1602406909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1602406909 is about 40030.0750561375. The cubic root of 1602406909 is about 1170.1932884938.

The spelling of 1602406909 in words is "one billion, six hundred two million, four hundred six thousand, nine hundred nine".