261441239 has 2 divisors, whose sum is σ = 261441240. Its totient is φ = 261441238.

The previous prime is 261441179. The next prime is 261441269. The reversal of 261441239 is 932144162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261441239 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 (261441269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130720619 + 130720620.

It is an arithmetic number, because the mean of its divisors is an integer number (130720620).

Almost surely, 2^261441239 is an apocalyptic number.

261441239 is a deficient number, since it is larger than the sum of its proper divisors (1).

261441239 is an equidigital number, since it uses as much as digits as its factorization.

261441239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 261441239 is about 16169.1446588866. The cubic root of 261441239 is about 639.4275798104.

The spelling of 261441239 in words is "two hundred sixty-one million, four hundred forty-one thousand, two hundred thirty-nine".