2561401 has 2 divisors, whose sum is σ = 2561402. Its totient is φ = 2561400.

The previous prime is 2561389. The next prime is 2561411. The reversal of 2561401 is 1041652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2310400 + 251001 = 1520^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561401 - 2¹³ = 2553209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2561411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280700 + 1280701.

It is an arithmetic number, because the mean of its divisors is an integer number (1280701).

2^2561401 is an apocalyptic number.

It is an amenable number.

2561401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561401 is an equidigital number, since it uses as much as digits as its factorization.

2561401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2561401 is about 1600.4377526165. The cubic root of 2561401 is about 136.8230261447.

The spelling of 2561401 in words is "two million, five hundred sixty-one thousand, four hundred one".