1809085613 has 2 divisors, whose sum is σ = 1809085614. Its totient is φ = 1809085612.

The previous prime is 1809085567. The next prime is 1809085633. The reversal of 1809085613 is 3165809081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532096164 + 276989449 = 39142^2 + 16643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1809085613 - 2¹⁸ = 1808823469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1809085633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904542806 + 904542807.

It is an arithmetic number, because the mean of its divisors is an integer number (904542807).

Almost surely, 2^1809085613 is an apocalyptic number.

It is an amenable number.

1809085613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809085613 is an equidigital number, since it uses as much as digits as its factorization.

1809085613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1809085613 is about 42533.3470702695. The cubic root of 1809085613 is about 1218.4836515727.

The spelling of 1809085613 in words is "one billion, eight hundred nine million, eighty-five thousand, six hundred thirteen".