2561541 has 8 divisors (see below), whose sum is σ = 3533280. Its totient is φ = 1648752.

The previous prime is 2561527. The next prime is 2561549. The reversal of 2561541 is 1451652.

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

It is not a de Polignac number, because 2561541 - 2¹⁰ = 2560517 is a prime.

It is a super-2 number, since 2×2561541² = 13122984589362, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561549) 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, 14635 + ... + 14808.

It is an arithmetic number, because the mean of its divisors is an integer number (441660).

2^2561541 is an apocalyptic number.

It is an amenable number.

2561541 is a deficient number, since it is larger than the sum of its proper divisors (971739).

2561541 is a wasteful number, since it uses less digits than its factorization.

2561541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29475.

The product of its digits is 1200, while the sum is 24.

The square root of 2561541 is about 1600.4814900523. The cubic root of 2561541 is about 136.8255189048.

The spelling of 2561541 in words is "two million, five hundred sixty-one thousand, five hundred forty-one".