86642249 has 4 divisors (see below), whose sum is σ = 86666436. Its totient is φ = 86618064.

The previous prime is 86642239. The next prime is 86642263. The reversal of 86642249 is 94224668.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16752649 + 69889600 = 4093^2 + 8360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86642249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86642239) 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 3 ways as a sum of consecutive naturals, for example, 5534 + ... + 14279.

It is an arithmetic number, because the mean of its divisors is an integer number (21666609).

Almost surely, 2^86642249 is an apocalyptic number.

It is an amenable number.

86642249 is a deficient number, since it is larger than the sum of its proper divisors (24187).

86642249 is a wasteful number, since it uses less digits than its factorization.

86642249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24186.

The product of its digits is 165888, while the sum is 41.

The square root of 86642249 is about 9308.1818310559. The cubic root of 86642249 is about 442.4965669454.

The spelling of 86642249 in words is "eighty-six million, six hundred forty-two thousand, two hundred forty-nine".