2561403401 has 2 divisors, whose sum is σ = 2561403402. Its totient is φ = 2561403400.

The previous prime is 2561403331. The next prime is 2561403443. The reversal of 2561403401 is 1043041652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2525163001 + 36240400 = 50251^2 + 6020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561403401 - 2¹⁰ = 2561402377 is a prime.

It is not a weakly prime, because it can be changed into another prime (2561402401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280701700 + 1280701701.

It is an arithmetic number, because the mean of its divisors is an integer number (1280701701).

Almost surely, 2^2561403401 is an apocalyptic number.

It is an amenable number.

2561403401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561403401 is an equidigital number, since it uses as much as digits as its factorization.

2561403401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 2561403401 is about 50610.3092363601. The cubic root of 2561403401 is about 1368.2306889626.

The spelling of 2561403401 in words is "two billion, five hundred sixty-one million, four hundred three thousand, four hundred one".