1605544113 has 4 divisors (see below), whose sum is σ = 2140725488. Its totient is φ = 1070362740.

The previous prime is 1605544037. The next prime is 1605544117. The reversal of 1605544113 is 3114455061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3114455061 = 3 ⋅1038151687.

It is not a de Polignac number, because 1605544113 - 2⁸ = 1605543857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1605544117) 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, 267590683 + ... + 267590688.

It is an arithmetic number, because the mean of its divisors is an integer number (535181372).

Almost surely, 2^1605544113 is an apocalyptic number.

It is an amenable number.

1605544113 is a deficient number, since it is larger than the sum of its proper divisors (535181375).

1605544113 is an equidigital number, since it uses as much as digits as its factorization.

1605544113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535181374.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1605544113 is about 40069.2414827134. The cubic root of 1605544113 is about 1170.9564616628.

Adding to 1605544113 its reverse (3114455061), we get a palindrome (4719999174).

The spelling of 1605544113 in words is "one billion, six hundred five million, five hundred forty-four thousand, one hundred thirteen".