1605120607 has 4 divisors (see below), whose sum is σ = 1623155760. Its totient is φ = 1587085456.

The previous prime is 1605120557. The next prime is 1605120631. The reversal of 1605120607 is 7060215061.

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

It is a cyclic number.

It is not a de Polignac number, because 1605120607 - 2¹⁵ = 1605087839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605121607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9017443 + ... + 9017620.

It is an arithmetic number, because the mean of its divisors is an integer number (405788940).

Almost surely, 2^1605120607 is an apocalyptic number.

1605120607 is a deficient number, since it is larger than the sum of its proper divisors (18035153).

1605120607 is an equidigital number, since it uses as much as digits as its factorization.

1605120607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18035152.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1605120607 is about 40063.9564571449. The cubic root of 1605120607 is about 1170.8534953864.

Adding to 1605120607 its reverse (7060215061), we get a palindrome (8665335668).

The spelling of 1605120607 in words is "one billion, six hundred five million, one hundred twenty thousand, six hundred seven".