855760561 has 2 divisors, whose sum is σ = 855760562. Its totient is φ = 855760560.

The previous prime is 855760547. The next prime is 855760567. The reversal of 855760561 is 165067558.

855760561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850072336 + 5688225 = 29156^2 + 2385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855760561 is a prime.

It is a super-2 number, since 2×855760561² = 1464652275526069442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855760567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427880280 + 427880281.

It is an arithmetic number, because the mean of its divisors is an integer number (427880281).

Almost surely, 2^855760561 is an apocalyptic number.

It is an amenable number.

855760561 is a deficient number, since it is larger than the sum of its proper divisors (1).

855760561 is an equidigital number, since it uses as much as digits as its factorization.

855760561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 43.

The square root of 855760561 is about 29253.3854621991. The cubic root of 855760561 is about 949.4033413141.

The spelling of 855760561 in words is "eight hundred fifty-five million, seven hundred sixty thousand, five hundred sixty-one".