2561347 has 4 divisors (see below), whose sum is σ = 2567880. Its totient is φ = 2554816.

The previous prime is 2561341. The next prime is 2561387. The reversal of 2561347 is 7431652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561341) 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, 2638 + ... + 3475.

It is an arithmetic number, because the mean of its divisors is an integer number (641970).

2^2561347 is an apocalyptic number.

2561347 is a deficient number, since it is larger than the sum of its proper divisors (6533).

2561347 is an equidigital number, since it uses as much as digits as its factorization.

2561347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6532.

The product of its digits is 5040, while the sum is 28.

The square root of 2561347 is about 1600.4208821432. The cubic root of 2561347 is about 136.8220646272.

Adding to 2561347 its reverse (7431652), we get a palindrome (9992999).

The spelling of 2561347 in words is "two million, five hundred sixty-one thousand, three hundred forty-seven".