86561647 has 2 divisors, whose sum is σ = 86561648. Its totient is φ = 86561646.

The previous prime is 86561633. The next prime is 86561653. The reversal of 86561647 is 74616568.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86561647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86561677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43280823 + 43280824.

It is an arithmetic number, because the mean of its divisors is an integer number (43280824).

Almost surely, 2^86561647 is an apocalyptic number.

86561647 is a deficient number, since it is larger than the sum of its proper divisors (1).

86561647 is an equidigital number, since it uses as much as digits as its factorization.

86561647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 86561647 is about 9303.8511918452. The cubic root of 86561647 is about 442.3593083743.

The spelling of 86561647 in words is "eighty-six million, five hundred sixty-one thousand, six hundred forty-seven".