261236879 has 2 divisors, whose sum is σ = 261236880. Its totient is φ = 261236878.

The previous prime is 261236873. The next prime is 261236893. The reversal of 261236879 is 978632162.

261236879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261236879 - 2⁸ = 261236623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261236873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130618439 + 130618440.

It is an arithmetic number, because the mean of its divisors is an integer number (130618440).

Almost surely, 2^261236879 is an apocalyptic number.

261236879 is a deficient number, since it is larger than the sum of its proper divisors (1).

261236879 is an equidigital number, since it uses as much as digits as its factorization.

261236879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 261236879 is about 16162.8239797382. The cubic root of 261236879 is about 639.2609298929.

The spelling of 261236879 in words is "two hundred sixty-one million, two hundred thirty-six thousand, eight hundred seventy-nine".