80985911 has 4 divisors (see below), whose sum is σ = 81285024. Its totient is φ = 80686800.

The previous prime is 80985901. The next prime is 80985917. The reversal of 80985911 is 11958908.

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 80985911 - 2²⁶ = 13877047 is a prime.

It is a super-3 number, since 3×80985911³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80985917) 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, 149150 + ... + 149691.

It is an arithmetic number, because the mean of its divisors is an integer number (20321256).

Almost surely, 2^80985911 is an apocalyptic number.

80985911 is a deficient number, since it is larger than the sum of its proper divisors (299113).

80985911 is a wasteful number, since it uses less digits than its factorization.

80985911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299112.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 80985911 is about 8999.2172437385. The cubic root of 80985911 is about 432.6497833978.

The spelling of 80985911 in words is "eighty million, nine hundred eighty-five thousand, nine hundred eleven".