2561206429 has 2 divisors, whose sum is σ = 2561206430. Its totient is φ = 2561206428.

The previous prime is 2561206421. The next prime is 2561206457. The reversal of 2561206429 is 9246021652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1352253529 + 1208952900 = 36773^2 + 34770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561206429 - 2³ = 2561206421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561206421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280603214 + 1280603215.

It is an arithmetic number, because the mean of its divisors is an integer number (1280603215).

Almost surely, 2^2561206429 is an apocalyptic number.

It is an amenable number.

2561206429 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561206429 is an equidigital number, since it uses as much as digits as its factorization.

2561206429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2561206429 is about 50608.3632317822. The cubic root of 2561206429 is about 1368.1956157363.

The spelling of 2561206429 in words is "two billion, five hundred sixty-one million, two hundred six thousand, four hundred twenty-nine".