86537612009 has 2 divisors, whose sum is σ = 86537612010. Its totient is φ = 86537612008.

The previous prime is 86537611999. The next prime is 86537612011. The reversal of 86537612009 is 90021673568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75691014400 + 10846597609 = 275120^2 + 104147^2 .

It is a cyclic number.

It is not a de Polignac number, because 86537612009 - 2³⁶ = 17818135273 is a prime.

It is a Sophie Germain prime.

Together with 86537612011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86537612099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43268806004 + 43268806005.

It is an arithmetic number, because the mean of its divisors is an integer number (43268806005).

Almost surely, 2^86537612009 is an apocalyptic number.

It is an amenable number.

86537612009 is a deficient number, since it is larger than the sum of its proper divisors (1).

86537612009 is an equidigital number, since it uses as much as digits as its factorization.

86537612009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 86537612009 in words is "eighty-six billion, five hundred thirty-seven million, six hundred twelve thousand, nine".