86521111 has 8 divisors (see below), whose sum is σ = 88830000. Its totient is φ = 84221760.

The previous prime is 86521103. The next prime is 86521129. The reversal of 86521111 is 11112568.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86521111 - 2³ = 86521103 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86521151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18345 + ... + 22573.

It is an arithmetic number, because the mean of its divisors is an integer number (11103750).

Almost surely, 2^86521111 is an apocalyptic number.

86521111 is a deficient number, since it is larger than the sum of its proper divisors (2308889).

86521111 is a wasteful number, since it uses less digits than its factorization.

86521111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769.

The product of its digits is 480, while the sum is 25.

The square root of 86521111 is about 9301.6724840214. The cubic root of 86521111 is about 442.2902467004.

Adding to 86521111 its reverse (11112568), we get a palindrome (97633679).

The spelling of 86521111 in words is "eighty-six million, five hundred twenty-one thousand, one hundred eleven".