2561129 has 2 divisors, whose sum is σ = 2561130. Its totient is φ = 2561128.

The previous prime is 2561099. The next prime is 2561137. The reversal of 2561129 is 9211652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317904 + 1243225 = 1148^2 + 1115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2561098 and 2561107.

It is not a weakly prime, because it can be changed into another prime (2561159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280564 + 1280565.

It is an arithmetic number, because the mean of its divisors is an integer number (1280565).

2^2561129 is an apocalyptic number.

It is an amenable number.

2561129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561129 is an equidigital number, since it uses as much as digits as its factorization.

2561129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 2561129 is about 1600.3527736096. The cubic root of 2561129 is about 136.8181828082.

The spelling of 2561129 in words is "two million, five hundred sixty-one thousand, one hundred twenty-nine".