8456287561 has 2 divisors, whose sum is σ = 8456287562. Its totient is φ = 8456287560.

The previous prime is 8456287559. The next prime is 8456287591. The reversal of 8456287561 is 1657826548.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6359105536 + 2097182025 = 79744^2 + 45795^2 .

It is a cyclic number.

It is not a de Polignac number, because 8456287561 - 2¹ = 8456287559 is a prime.

Together with 8456287559, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 8456287499 and 8456287508.

It is not a weakly prime, because it can be changed into another prime (8456287501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228143780 + 4228143781.

It is an arithmetic number, because the mean of its divisors is an integer number (4228143781).

Almost surely, 2^8456287561 is an apocalyptic number.

It is an amenable number.

8456287561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8456287561 is an equidigital number, since it uses as much as digits as its factorization.

8456287561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3225600, while the sum is 52.

The square root of 8456287561 is about 91958.0750179124. The cubic root of 8456287561 is about 2037.3231230199.

The spelling of 8456287561 in words is "eight billion, four hundred fifty-six million, two hundred eighty-seven thousand, five hundred sixty-one".