2301661 has 4 divisors (see below), whose sum is σ = 2355232. Its totient is φ = 2248092.

The previous prime is 2301623. The next prime is 2301683. The reversal of 2301661 is 1661032.

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 a cyclic number.

It is not a de Polignac number, because 2301661 - 2²¹ = 204509 is a prime.

It is a super-3 number, since 3×2301661³ = 36580137333412403343, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2301601) 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, 26721 + ... + 26806.

It is an arithmetic number, because the mean of its divisors is an integer number (588808).

2^2301661 is an apocalyptic number.

It is an amenable number.

2301661 is a deficient number, since it is larger than the sum of its proper divisors (53571).

2301661 is an equidigital number, since it uses as much as digits as its factorization.

2301661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53570.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2301661 is about 1517.1226054607. The cubic root of 2301661 is about 132.0323803330.

Adding to 2301661 its reverse (1661032), we get a palindrome (3962693).

It can be divided in two parts, 230 and 1661, that added together give a triangular number (1891 = T₆₁).

The spelling of 2301661 in words is "two million, three hundred one thousand, six hundred sixty-one".