86643331 has 4 divisors (see below), whose sum is σ = 86770872. Its totient is φ = 86515792.

The previous prime is 86643317. The next prime is 86643341. The reversal of 86643331 is 13334668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86643331 - 2⁵ = 86643299 is a prime.

It is a super-2 number, since 2×86643331² = 15014133613551122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (86643341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62746 + ... + 64111.

It is an arithmetic number, because the mean of its divisors is an integer number (21692718).

Almost surely, 2^86643331 is an apocalyptic number.

86643331 is a deficient number, since it is larger than the sum of its proper divisors (127541).

86643331 is a wasteful number, since it uses less digits than its factorization.

86643331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127540.

The product of its digits is 31104, while the sum is 34.

The square root of 86643331 is about 9308.2399517847. The cubic root of 86643331 is about 442.4984089232.

Adding to 86643331 its reverse (13334668), we get a palindrome (99977999).

The spelling of 86643331 in words is "eighty-six million, six hundred forty-three thousand, three hundred thirty-one".