1605013 has 2 divisors, whose sum is σ = 1605014. Its totient is φ = 1605012.

The previous prime is 1605001. The next prime is 1605017. The reversal of 1605013 is 3105061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1580049 + 24964 = 1257^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605013 - 2⁹ = 1604501 is a prime.

It is an Ulam number.

1605013 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802506 + 802507.

It is an arithmetic number, because the mean of its divisors is an integer number (802507).

2^1605013 is an apocalyptic number.

It is an amenable number.

1605013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605013 is an equidigital number, since it uses as much as digits as its factorization.

1605013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 1605013 is about 1266.8910766124. The cubic root of 1605013 is about 117.0827330198.

The spelling of 1605013 in words is "one million, six hundred five thousand, thirteen".