2561131 has 8 divisors (see below), whose sum is σ = 2640960. Its totient is φ = 2482632.

The previous prime is 2561129. The next prime is 2561137. The reversal of 2561131 is 1311652.

2561131 = T₈₆ + T₈₇ + ... + T₂₅₁.

2561131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2561131 - 2¹ = 2561129 is a prime.

It is a super-2 number, since 2×2561131² = 13118783998322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2561099 and 2561108.

It is not an unprimeable number, because it can be changed into a prime (2561137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4636 + ... + 5158.

It is an arithmetic number, because the mean of its divisors is an integer number (330120).

2^2561131 is an apocalyptic number.

2561131 is a deficient number, since it is larger than the sum of its proper divisors (79829).

2561131 is an equidigital number, since it uses as much as digits as its factorization.

2561131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665.

The product of its digits is 180, while the sum is 19.

The square root of 2561131 is about 1600.3533984717. The cubic root of 2561131 is about 136.8182184222.

Adding to 2561131 its reverse (1311652), we get a palindrome (3872783).

The spelling of 2561131 in words is "two million, five hundred sixty-one thousand, one hundred thirty-one".