86512221 has 6 divisors (see below), whose sum is σ = 124962110. Its totient is φ = 57674808.

The previous prime is 86512219. The next prime is 86512229. The reversal of 86512221 is 12221568.

It is a happy number.

86512221 is a `hidden beast` number, since 8 + 651 + 2 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 80192025 + 6320196 = 8955^2 + 2514^2 .

It is not a de Polignac number, because 86512221 - 2¹ = 86512219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86512229) 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 in 5 ways as a sum of consecutive naturals, for example, 4806226 + ... + 4806243.

Almost surely, 2^86512221 is an apocalyptic number.

It is an amenable number.

86512221 is a deficient number, since it is larger than the sum of its proper divisors (38449889).

86512221 is a wasteful number, since it uses less digits than its factorization.

86512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9612475 (or 9612472 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 86512221 is about 9301.1946006951. The cubic root of 86512221 is about 442.2750978158.

Adding to 86512221 its reverse (12221568), we get a palindrome (98733789).

The spelling of 86512221 in words is "eighty-six million, five hundred twelve thousand, two hundred twenty-one".