260120561 has 2 divisors, whose sum is σ = 260120562. Its totient is φ = 260120560.

The previous prime is 260120533. The next prime is 260120611. The reversal of 260120561 is 165021062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191545600 + 68574961 = 13840^2 + 8281^2 .

It is a cyclic number.

It is not a de Polignac number, because 260120561 - 2¹⁰ = 260119537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (260120261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130060280 + 130060281.

It is an arithmetic number, because the mean of its divisors is an integer number (130060281).

Almost surely, 2^260120561 is an apocalyptic number.

It is an amenable number.

260120561 is a deficient number, since it is larger than the sum of its proper divisors (1).

260120561 is an equidigital number, since it uses as much as digits as its factorization.

260120561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 260120561 is about 16128.2535012319. The cubic root of 260120561 is about 638.3490660650.

The spelling of 260120561 in words is "two hundred sixty million, one hundred twenty thousand, five hundred sixty-one".