2561878229 has 2 divisors, whose sum is σ = 2561878230. Its totient is φ = 2561878228.

The previous prime is 2561878219. The next prime is 2561878273. The reversal of 2561878229 is 9228781652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2561878225 + 4 = 50615^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561878229 - 2⁴ = 2561878213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561878219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280939114 + 1280939115.

It is an arithmetic number, because the mean of its divisors is an integer number (1280939115).

Almost surely, 2^2561878229 is an apocalyptic number.

It is an amenable number.

2561878229 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561878229 is an equidigital number, since it uses as much as digits as its factorization.

2561878229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The square root of 2561878229 is about 50615.0000395140. Note that the first 4 decimals coincide. The cubic root of 2561878229 is about 1368.3152303902.

The spelling of 2561878229 in words is "two billion, five hundred sixty-one million, eight hundred seventy-eight thousand, two hundred twenty-nine".