261788339 has 2 divisors, whose sum is σ = 261788340. Its totient is φ = 261788338.

The previous prime is 261788309. The next prime is 261788347. The reversal of 261788339 is 933887162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261788339 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 261788293 and 261788302.

It is not a weakly prime, because it can be changed into another prime (261788309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130894169 + 130894170.

It is an arithmetic number, because the mean of its divisors is an integer number (130894170).

Almost surely, 2^261788339 is an apocalyptic number.

261788339 is a deficient number, since it is larger than the sum of its proper divisors (1).

261788339 is an equidigital number, since it uses as much as digits as its factorization.

261788339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 261788339 is about 16179.8745050757. The cubic root of 261788339 is about 639.7104313414.

The spelling of 261788339 in words is "two hundred sixty-one million, seven hundred eighty-eight thousand, three hundred thirty-nine".