1605051265 has 4 divisors (see below), whose sum is σ = 1926061524. Its totient is φ = 1284041008.

The previous prime is 1605051241. The next prime is 1605051299. The reversal of 1605051265 is 5621505061.

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 963543681 + 641507584 = 31041^2 + 25328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605051265 - 2¹⁵ = 1605018497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160505122 + ... + 160505131.

It is an arithmetic number, because the mean of its divisors is an integer number (481515381).

Almost surely, 2^1605051265 is an apocalyptic number.

It is an amenable number.

1605051265 is a deficient number, since it is larger than the sum of its proper divisors (321010259).

1605051265 is an equidigital number, since it uses as much as digits as its factorization.

1605051265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321010258.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 1605051265 is about 40063.0910564824. The cubic root of 1605051265 is about 1170.8366346613.

The spelling of 1605051265 in words is "one billion, six hundred five million, fifty-one thousand, two hundred sixty-five".