261080329 has 2 divisors, whose sum is σ = 261080330. Its totient is φ = 261080328.

The previous prime is 261080327. The next prime is 261080341. The reversal of 261080329 is 923080162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170354704 + 90725625 = 13052^2 + 9525^2 .

It is a cyclic number.

It is not a de Polignac number, because 261080329 - 2¹ = 261080327 is a prime.

Together with 261080327, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261080329.

It is not a weakly prime, because it can be changed into another prime (261080327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130540164 + 130540165.

It is an arithmetic number, because the mean of its divisors is an integer number (130540165).

Almost surely, 2^261080329 is an apocalyptic number.

It is an amenable number.

261080329 is a deficient number, since it is larger than the sum of its proper divisors (1).

261080329 is an equidigital number, since it uses as much as digits as its factorization.

261080329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 261080329 is about 16157.9803502789. The cubic root of 261080329 is about 639.1332089061.

The spelling of 261080329 in words is "two hundred sixty-one million, eighty thousand, three hundred twenty-nine".