86996561 has 2 divisors, whose sum is σ = 86996562. Its totient is φ = 86996560.

The previous prime is 86996543. The next prime is 86996563. The reversal of 86996561 is 16569968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80442961 + 6553600 = 8969^2 + 2560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86996561 is a prime.

Together with 86996563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86996563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43498280 + 43498281.

It is an arithmetic number, because the mean of its divisors is an integer number (43498281).

Almost surely, 2^86996561 is an apocalyptic number.

It is an amenable number.

86996561 is a deficient number, since it is larger than the sum of its proper divisors (1).

86996561 is an equidigital number, since it uses as much as digits as its factorization.

86996561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 50.

The square root of 86996561 is about 9327.1947015166. The cubic root of 86996561 is about 443.0989236354.

The spelling of 86996561 in words is "eighty-six million, nine hundred ninety-six thousand, five hundred sixty-one".