80111591 has 4 divisors (see below), whose sum is σ = 91556112. Its totient is φ = 68667072.

The previous prime is 80111579. The next prime is 80111597. The reversal of 80111591 is 19511108.

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 80111591 - 2¹⁰ = 80110567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80111591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80111597) 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, 5722250 + ... + 5722263.

It is an arithmetic number, because the mean of its divisors is an integer number (22889028).

Almost surely, 2^80111591 is an apocalyptic number.

80111591 is a deficient number, since it is larger than the sum of its proper divisors (11444521).

80111591 is a wasteful number, since it uses less digits than its factorization.

80111591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11444520.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 80111591 is about 8950.5078626858. The cubic root of 80111591 is about 431.0871911929.

Adding to 80111591 its reverse (19511108), we get a palindrome (99622699).

The spelling of 80111591 in words is "eighty million, one hundred eleven thousand, five hundred ninety-one".