86519869 has 2 divisors, whose sum is σ = 86519870. Its totient is φ = 86519868.

The previous prime is 86519831. The next prime is 86519921. The reversal of 86519869 is 96891568.

It is an a-pointer prime, because the next prime (86519921) can be obtained adding 86519869 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58323769 + 28196100 = 7637^2 + 5310^2 .

It is a cyclic number.

It is not a de Polignac number, because 86519869 - 2¹⁵ = 86487101 is a prime.

It is a super-2 number, since 2×86519869² = 14971375463554322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86519269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43259934 + 43259935.

It is an arithmetic number, because the mean of its divisors is an integer number (43259935).

Almost surely, 2^86519869 is an apocalyptic number.

It is an amenable number.

86519869 is a deficient number, since it is larger than the sum of its proper divisors (1).

86519869 is an equidigital number, since it uses as much as digits as its factorization.

86519869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 52.

The square root of 86519869 is about 9301.6057215945. The cubic root of 86519869 is about 442.2881303494.

The spelling of 86519869 in words is "eighty-six million, five hundred nineteen thousand, eight hundred sixty-nine".