86719517 has 2 divisors, whose sum is σ = 86719518. Its totient is φ = 86719516.

The previous prime is 86719487. The next prime is 86719561. The reversal of 86719517 is 71591768.

It is an a-pointer prime, because the next prime (86719561) can be obtained adding 86719517 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69322276 + 17397241 = 8326^2 + 4171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86719517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86719417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43359758 + 43359759.

It is an arithmetic number, because the mean of its divisors is an integer number (43359759).

Almost surely, 2^86719517 is an apocalyptic number.

It is an amenable number.

86719517 is a deficient number, since it is larger than the sum of its proper divisors (1).

86719517 is an equidigital number, since it uses as much as digits as its factorization.

86719517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 86719517 is about 9312.3314481391. The cubic root of 86719517 is about 442.6280680945.

The spelling of 86719517 in words is "eighty-six million, seven hundred nineteen thousand, five hundred seventeen".