86490861217 has 2 divisors, whose sum is σ = 86490861218. Its totient is φ = 86490861216.

The previous prime is 86490861169. The next prime is 86490861253. The reversal of 86490861217 is 71216809468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56214513216 + 30276348001 = 237096^2 + 174001^2 .

It is a cyclic number.

It is not a de Polignac number, because 86490861217 - 2¹⁵ = 86490828449 is a prime.

It is not a weakly prime, because it can be changed into another prime (86490865217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43245430608 + 43245430609.

It is an arithmetic number, because the mean of its divisors is an integer number (43245430609).

Almost surely, 2^86490861217 is an apocalyptic number.

It is an amenable number.

86490861217 is a deficient number, since it is larger than the sum of its proper divisors (1).

86490861217 is an equidigital number, since it uses as much as digits as its factorization.

86490861217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 86490861217 in words is "eighty-six billion, four hundred ninety million, eight hundred sixty-one thousand, two hundred seventeen".