1605240545 has 4 divisors (see below), whose sum is σ = 1926288660. Its totient is φ = 1284192432.

The previous prime is 1605240529. The next prime is 1605240547. The reversal of 1605240545 is 5450425061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 923612881 + 681627664 = 30391^2 + 26108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605240545 - 2⁴ = 1605240529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1605240547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160524050 + ... + 160524059.

It is an arithmetic number, because the mean of its divisors is an integer number (481572165).

Almost surely, 2^1605240545 is an apocalyptic number.

It is an amenable number.

1605240545 is a deficient number, since it is larger than the sum of its proper divisors (321048115).

1605240545 is an equidigital number, since it uses as much as digits as its factorization.

1605240545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321048114.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 1605240545 is about 40065.4532608830. The cubic root of 1605240545 is about 1170.8826575417.

The spelling of 1605240545 in words is "one billion, six hundred five million, two hundred forty thousand, five hundred forty-five".