2561447 has 8 divisors (see below), whose sum is σ = 3081600. Its totient is φ = 2079864.

The previous prime is 2561431. The next prime is 2561491. The reversal of 2561447 is 7441652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561447 - 2⁴ = 2561431 is a prime.

It is a super-2 number, since 2×2561447² = 13122021467618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9497 + ... + 9762.

It is an arithmetic number, because the mean of its divisors is an integer number (385200).

2^2561447 is an apocalyptic number.

2561447 is a deficient number, since it is larger than the sum of its proper divisors (520153).

2561447 is a wasteful number, since it uses less digits than its factorization.

2561447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19285.

The product of its digits is 6720, while the sum is 29.

The square root of 2561447 is about 1600.4521236201. The cubic root of 2561447 is about 136.8238452044.

The spelling of 2561447 in words is "two million, five hundred sixty-one thousand, four hundred forty-seven".