2561306 has 8 divisors (see below), whose sum is σ = 4191264. Its totient is φ = 1164220.

The previous prime is 2561291. The next prime is 2561323. The reversal of 2561306 is 6031652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58190 + ... + 58233.

It is an arithmetic number, because the mean of its divisors is an integer number (523908).

2^2561306 is an apocalyptic number.

2561306 is a deficient number, since it is larger than the sum of its proper divisors (1629958).

2561306 is a wasteful number, since it uses less digits than its factorization.

2561306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116436.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2561306 is about 1600.4080729614. The cubic root of 2561306 is about 136.8213345771.

Adding to 2561306 its reverse (6031652), we get a palindrome (8592958).

The spelling of 2561306 in words is "two million, five hundred sixty-one thousand, three hundred six".