1605040169 has 2 divisors, whose sum is σ = 1605040170. Its totient is φ = 1605040168.

The previous prime is 1605040093. The next prime is 1605040183. The reversal of 1605040169 is 9610405061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1601040169 + 4000000 = 40013^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605040169 - 2¹² = 1605036073 is a prime.

It is a super-2 number, since 2×1605040169² = 5152307888207097122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1605070169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802520084 + 802520085.

It is an arithmetic number, because the mean of its divisors is an integer number (802520085).

Almost surely, 2^1605040169 is an apocalyptic number.

It is an amenable number.

1605040169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605040169 is an equidigital number, since it uses as much as digits as its factorization.

1605040169 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 32.

The square root of 1605040169 is about 40062.9525746668. The cubic root of 1605040169 is about 1170.8339365889.

The spelling of 1605040169 in words is "one billion, six hundred five million, forty thousand, one hundred sixty-nine".