261141239 has 2 divisors, whose sum is σ = 261141240. Its totient is φ = 261141238.

The previous prime is 261141191. The next prime is 261141253. The reversal of 261141239 is 932141162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261141239 - 2⁸ = 261140983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261141289) 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, 130570619 + 130570620.

It is an arithmetic number, because the mean of its divisors is an integer number (130570620).

Almost surely, 2^261141239 is an apocalyptic number.

261141239 is a deficient number, since it is larger than the sum of its proper divisors (1).

261141239 is an equidigital number, since it uses as much as digits as its factorization.

261141239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 261141239 is about 16159.8650675060. The cubic root of 261141239 is about 639.1829082673.

The spelling of 261141239 in words is "two hundred sixty-one million, one hundred forty-one thousand, two hundred thirty-nine".