2651565 has 16 divisors (see below), whose sum is σ = 4848768. Its totient is φ = 1212096.

The previous prime is 2651549. The next prime is 2651569. The reversal of 2651565 is 5651562.

It is not a de Polignac number, because 2651565 - 2⁴ = 2651549 is a prime.

It is a Curzon number.

2651565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12522 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (303048).

2^2651565 is an apocalyptic number.

It is an amenable number.

2651565 is a deficient number, since it is larger than the sum of its proper divisors (2197203).

2651565 is a wasteful number, since it uses less digits than its factorization.

2651565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25268.

The product of its digits is 9000, while the sum is 30.

The square root of 2651565 is about 1628.3626745906. The cubic root of 2651565 is about 138.4099863878.

It can be divided in two parts, 265 and 1565, that added together give a triangular number (1830 = T₆₀).

The spelling of 2651565 in words is "two million, six hundred fifty-one thousand, five hundred sixty-five".