260211561 has 4 divisors (see below), whose sum is σ = 346948752. Its totient is φ = 173474372.

The previous prime is 260211529. The next prime is 260211563. The reversal of 260211561 is 165112062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 260211561 - 2⁵ = 260211529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (260211563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43368591 + ... + 43368596.

It is an arithmetic number, because the mean of its divisors is an integer number (86737188).

Almost surely, 2^260211561 is an apocalyptic number.

It is an amenable number.

260211561 is a deficient number, since it is larger than the sum of its proper divisors (86737191).

260211561 is an equidigital number, since it uses as much as digits as its factorization.

260211561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86737190.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 260211561 is about 16131.0743907528. The cubic root of 260211561 is about 638.4234969265.

The spelling of 260211561 in words is "two hundred sixty million, two hundred eleven thousand, five hundred sixty-one".