80861111 has 4 divisors (see below), whose sum is σ = 80960424. Its totient is φ = 80761800.

The previous prime is 80861107. The next prime is 80861147. The reversal of 80861111 is 11116808.

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 80861111 - 2² = 80861107 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 (80861611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48425 + ... + 50066.

It is an arithmetic number, because the mean of its divisors is an integer number (20240106).

Almost surely, 2^80861111 is an apocalyptic number.

80861111 is a deficient number, since it is larger than the sum of its proper divisors (99313).

80861111 is an equidigital number, since it uses as much as digits as its factorization.

80861111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99312.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 80861111 is about 8992.2806339660. The cubic root of 80861111 is about 432.4274301041.

Adding to 80861111 its reverse (11116808), we get a palindrome (91977919).

The spelling of 80861111 in words is "eighty million, eight hundred sixty-one thousand, one hundred eleven".