86642111 has 4 divisors (see below), whose sum is σ = 89629800. Its totient is φ = 83654424.

The previous prime is 86642107. The next prime is 86642131. The reversal of 86642111 is 11124668.

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 86642111 - 2² = 86642107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2987659 = 86642111 / (8 + 6 + 6 + 4 + 2 + 1 + 1 + 1).

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 (86642131) 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, 1493801 + ... + 1493858.

It is an arithmetic number, because the mean of its divisors is an integer number (22407450).

Almost surely, 2^86642111 is an apocalyptic number.

86642111 is a deficient number, since it is larger than the sum of its proper divisors (2987689).

86642111 is a wasteful number, since it uses less digits than its factorization.

86642111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987688.

The product of its digits is 2304, while the sum is 29.

The square root of 86642111 is about 9308.1744182197. The cubic root of 86642111 is about 442.4963320155.

Adding to 86642111 its reverse (11124668), we get a palindrome (97766779).

The spelling of 86642111 in words is "eighty-six million, six hundred forty-two thousand, one hundred eleven".