86219909 has 2 divisors, whose sum is σ = 86219910. Its totient is φ = 86219908.

The previous prime is 86219863. The next prime is 86219911. The reversal of 86219909 is 90991268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59985025 + 26234884 = 7745^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 86219909 - 2¹⁶ = 86154373 is a prime.

Together with 86219911, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86219909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86219989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43109954 + 43109955.

It is an arithmetic number, because the mean of its divisors is an integer number (43109955).

Almost surely, 2^86219909 is an apocalyptic number.

It is an amenable number.

86219909 is a deficient number, since it is larger than the sum of its proper divisors (1).

86219909 is an equidigital number, since it uses as much as digits as its factorization.

86219909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 86219909 is about 9285.4676241964. The cubic root of 86219909 is about 441.7764083457.

The spelling of 86219909 in words is "eighty-six million, two hundred nineteen thousand, nine hundred nine".