1606040509 has 2 divisors, whose sum is σ = 1606040510. Its totient is φ = 1606040508.

The previous prime is 1606040477. The next prime is 1606040549. The reversal of 1606040509 is 9050406061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1442328484 + 163712025 = 37978^2 + 12795^2 .

It is an emirp because it is prime and its reverse (9050406061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1606040509 - 2⁵ = 1606040477 is a prime.

It is a super-2 number, since 2×1606040509² = 5158732233097958162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606040549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803020254 + 803020255.

It is an arithmetic number, because the mean of its divisors is an integer number (803020255).

Almost surely, 2^1606040509 is an apocalyptic number.

It is an amenable number.

1606040509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606040509 is an equidigital number, since it uses as much as digits as its factorization.

1606040509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1606040509 is about 40075.4352315730. The cubic root of 1606040509 is about 1171.0771265111.

The spelling of 1606040509 in words is "one billion, six hundred six million, forty thousand, five hundred nine".