2365661 has 4 divisors (see below), whose sum is σ = 2368800. Its totient is φ = 2362524.

The previous prime is 2365639. The next prime is 2365667. The reversal of 2365661 is 1665632.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2365661 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 (2365667) 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, 320 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (592200).

2^2365661 is an apocalyptic number.

It is an amenable number.

2365661 is a deficient number, since it is larger than the sum of its proper divisors (3139).

2365661 is a wasteful number, since it uses less digits than its factorization.

2365661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138.

The product of its digits is 6480, while the sum is 29.

The square root of 2365661 is about 1538.0705445460. The cubic root of 2365661 is about 133.2449740967.

Subtracting from 2365661 its sum of digits (29), we obtain a palindrome (2365632).

The spelling of 2365661 in words is "two million, three hundred sixty-five thousand, six hundred sixty-one".