2288661 has 16 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 1422080.

The previous prime is 2288641. The next prime is 2288677. The reversal of 2288661 is 1668822.

It is a 4-Lehmer number, since φ(2288661) divides (2288661-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 2288661 - 2⁶ = 2288597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2288641) 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, 2425 + ... + 3233.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

It is a Poulet number, since it divides 2^2288660-1.

2^2288661 is an apocalyptic number.

2288661 is the 809-th nonagonal number.

It is an amenable number.

2288661 is a deficient number, since it is larger than the sum of its proper divisors (977259).

2288661 is a wasteful number, since it uses less digits than its factorization.

2288661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 9216, while the sum is 33.

The square root of 2288661 is about 1512.8321122980. The cubic root of 2288661 is about 131.7833337205.

The spelling of 2288661 in words is "two million, two hundred eighty-eight thousand, six hundred sixty-one".