86686421 has 2 divisors, whose sum is σ = 86686422. Its totient is φ = 86686420.

The previous prime is 86686387. The next prime is 86686427. The reversal of 86686421 is 12468668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50566321 + 36120100 = 7111^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 86686421 - 2¹⁴ = 86670037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86686427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43343210 + 43343211.

It is an arithmetic number, because the mean of its divisors is an integer number (43343211).

Almost surely, 2^86686421 is an apocalyptic number.

It is an amenable number.

86686421 is a deficient number, since it is larger than the sum of its proper divisors (1).

86686421 is an equidigital number, since it uses as much as digits as its factorization.

86686421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 41.

The square root of 86686421 is about 9310.5542799556. The cubic root of 86686421 is about 442.5717521192.

The spelling of 86686421 in words is "eighty-six million, six hundred eighty-six thousand, four hundred twenty-one".