86939219 has 2 divisors, whose sum is σ = 86939220. Its totient is φ = 86939218.

The previous prime is 86939197. The next prime is 86939227. The reversal of 86939219 is 91293968.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86939219 is a prime.

It is a super-2 number, since 2×86939219² = 15116855600659922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86939299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43469609 + 43469610.

It is an arithmetic number, because the mean of its divisors is an integer number (43469610).

Almost surely, 2^86939219 is an apocalyptic number.

86939219 is a deficient number, since it is larger than the sum of its proper divisors (1).

86939219 is an equidigital number, since it uses as much as digits as its factorization.

86939219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 86939219 is about 9324.1202802195. The cubic root of 86939219 is about 443.0015490471.

The spelling of 86939219 in words is "eighty-six million, nine hundred thirty-nine thousand, two hundred nineteen".