3651265 has 4 divisors (see below), whose sum is σ = 4381524. Its totient is φ = 2921008.

The previous prime is 3651239. The next prime is 3651269. The reversal of 3651265 is 5621563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5621563 = 29 ⋅193847.

It can be written as a sum of positive squares in 2 ways, for example, as 815409 + 2835856 = 903^2 + 1684^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651265 - 2¹⁵ = 3618497 is a prime.

It is a super-2 number, since 2×3651265² = 26663472200450, which contains 22 as substring.

It is a Duffinian number.

3651265 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3651269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365122 + ... + 365131.

It is an arithmetic number, because the mean of its divisors is an integer number (1095381).

Almost surely, 2^3651265 is an apocalyptic number.

It is an amenable number.

3651265 is a deficient number, since it is larger than the sum of its proper divisors (730259).

3651265 is an equidigital number, since it uses as much as digits as its factorization.

3651265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730258.

The product of its digits is 5400, while the sum is 28.

The square root of 3651265 is about 1910.8283544055. The cubic root of 3651265 is about 153.9859575659.

It can be divided in two parts, 3651 and 265, that added together give a triangular number (3916 = T₈₈).

The spelling of 3651265 in words is "three million, six hundred fifty-one thousand, two hundred sixty-five".