1605313 has 2 divisors, whose sum is σ = 1605314. Its totient is φ = 1605312.

The previous prime is 1605299. The next prime is 1605323. The reversal of 1605313 is 3135061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1272384 + 332929 = 1128^2 + 577^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605313 - 2¹⁷ = 1474241 is a prime.

It is equal to p₁₂₁₅₂₈ and since 1605313 and 121528 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1605323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802656 + 802657.

It is an arithmetic number, because the mean of its divisors is an integer number (802657).

2^1605313 is an apocalyptic number.

It is an amenable number.

1605313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605313 is an equidigital number, since it uses as much as digits as its factorization.

1605313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1605313 is about 1267.0094711564. The cubic root of 1605313 is about 117.0900273806.

The spelling of 1605313 in words is "one million, six hundred five thousand, three hundred thirteen".