2561423 has 2 divisors, whose sum is σ = 2561424. Its totient is φ = 2561422.

The previous prime is 2561411. The next prime is 2561431. The reversal of 2561423 is 3241652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561423 - 2¹⁰ = 2560399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280711 + 1280712.

It is an arithmetic number, because the mean of its divisors is an integer number (1280712).

2^2561423 is an apocalyptic number.

2561423 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561423 is an equidigital number, since it uses as much as digits as its factorization.

2561423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 2561423 is about 1600.4446257212. Note that the first 3 decimals coincide. The cubic root of 2561423 is about 136.8234178701.

The spelling of 2561423 in words is "two million, five hundred sixty-one thousand, four hundred twenty-three".