86977817 has 2 divisors, whose sum is σ = 86977818. Its totient is φ = 86977816.

The previous prime is 86977783. The next prime is 86977819. The reversal of 86977817 is 71877968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 24314761 = 7916^2 + 4931^2 .

It is a cyclic number.

It is not a de Polignac number, because 86977817 - 2¹⁶ = 86912281 is a prime.

Together with 86977819, 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 (86977819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43488908 + 43488909.

It is an arithmetic number, because the mean of its divisors is an integer number (43488909).

Almost surely, 2^86977817 is an apocalyptic number.

It is an amenable number.

86977817 is a deficient number, since it is larger than the sum of its proper divisors (1).

86977817 is an equidigital number, since it uses as much as digits as its factorization.

86977817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 53.

The square root of 86977817 is about 9326.1898436607. The cubic root of 86977817 is about 443.0670984587.

The spelling of 86977817 in words is "eighty-six million, nine hundred seventy-seven thousand, eight hundred seventeen".