2365561 has 4 divisors (see below), whose sum is σ = 2580624. Its totient is φ = 2150500.

The previous prime is 2365553. The next prime is 2365589. The reversal of 2365561 is 1655632.

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.

It is not a de Polignac number, because 2365561 - 2³ = 2365553 is a prime.

It is a Duffinian number.

2365561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2365511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107515 + ... + 107536.

It is an arithmetic number, because the mean of its divisors is an integer number (645156).

2^2365561 is an apocalyptic number.

It is an amenable number.

2365561 is a deficient number, since it is larger than the sum of its proper divisors (215063).

2365561 is a wasteful number, since it uses less digits than its factorization.

2365561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215062.

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

The square root of 2365561 is about 1538.0380359406. The cubic root of 2365561 is about 133.2430965826.

It can be divided in two parts, 23655 and 61, that added together give a square (23716 = 154²).

The spelling of 2365561 in words is "two million, three hundred sixty-five thousand, five hundred sixty-one".