2661559 has 4 divisors (see below), whose sum is σ = 2673216. Its totient is φ = 2649904.

The previous prime is 2661557. The next prime is 2661569. The reversal of 2661559 is 9551662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2661559 - 2¹ = 2661557 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 (2661553) 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, 5479 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (668304).

2^2661559 is an apocalyptic number.

2661559 is a deficient number, since it is larger than the sum of its proper divisors (11657).

2661559 is a wasteful number, since it uses less digits than its factorization.

2661559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656.

The product of its digits is 16200, while the sum is 34.

The square root of 2661559 is about 1631.4285151364. The cubic root of 2661559 is about 138.5836618263.

The spelling of 2661559 in words is "two million, six hundred sixty-one thousand, five hundred fifty-nine".