2561147 has 4 divisors (see below), whose sum is σ = 2623656. Its totient is φ = 2498640.

The previous prime is 2561137. The next prime is 2561159. The reversal of 2561147 is 7411652.

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 2561147 - 2⁸ = 2560891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561137) 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, 31193 + ... + 31274.

It is an arithmetic number, because the mean of its divisors is an integer number (655914).

2^2561147 is an apocalyptic number.

2561147 is a deficient number, since it is larger than the sum of its proper divisors (62509).

2561147 is an equidigital number, since it uses as much as digits as its factorization.

2561147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62508.

The product of its digits is 1680, while the sum is 26.

The square root of 2561147 is about 1600.3583973598. The cubic root of 2561147 is about 136.8185033337.

Adding to 2561147 its reverse (7411652), we get a palindrome (9972799).

The spelling of 2561147 in words is "two million, five hundred sixty-one thousand, one hundred forty-seven".