86837209 has 2 divisors, whose sum is σ = 86837210. Its totient is φ = 86837208.

The previous prime is 86837183. The next prime is 86837227. The reversal of 86837209 is 90273868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 17614809 = 8320^2 + 4197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86837209 is a prime.

It is not a weakly prime, because it can be changed into another prime (86831209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43418604 + 43418605.

It is an arithmetic number, because the mean of its divisors is an integer number (43418605).

Almost surely, 2^86837209 is an apocalyptic number.

It is an amenable number.

86837209 is a deficient number, since it is larger than the sum of its proper divisors (1).

86837209 is an equidigital number, since it uses as much as digits as its factorization.

86837209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 86837209 is about 9318.6484535044. The cubic root of 86837209 is about 442.8282161721.

The spelling of 86837209 in words is "eighty-six million, eight hundred thirty-seven thousand, two hundred nine".