2561081 has 4 divisors (see below), whose sum is σ = 2566032. Its totient is φ = 2556132.

The previous prime is 2561071. The next prime is 2561089. The reversal of 2561081 is 1801652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2561081 - 2⁶ = 2561017 is a prime.

It is a super-2 number, since 2×2561081² = 13118271777122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2561089) 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, 1595 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (641508).

2^2561081 is an apocalyptic number.

It is an amenable number.

2561081 is a deficient number, since it is larger than the sum of its proper divisors (4951).

2561081 is an equidigital number, since it uses as much as digits as its factorization.

2561081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2561081 is about 1600.3377768459. The cubic root of 2561081 is about 136.8173280662.

The spelling of 2561081 in words is "two million, five hundred sixty-one thousand, eighty-one".