80185139 has 4 divisors (see below), whose sum is σ = 80894856. Its totient is φ = 79475424.

The previous prime is 80185123. The next prime is 80185159. The reversal of 80185139 is 93158108.

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 80185139 - 2⁴ = 80185123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80185099 and 80185108.

It is not an unprimeable number, because it can be changed into a prime (80185159) 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, 354689 + ... + 354914.

It is an arithmetic number, because the mean of its divisors is an integer number (20223714).

Almost surely, 2^80185139 is an apocalyptic number.

80185139 is a deficient number, since it is larger than the sum of its proper divisors (709717).

80185139 is a wasteful number, since it uses less digits than its factorization.

80185139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709716.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 80185139 is about 8954.6155138007. The cubic root of 80185139 is about 431.2190734946.

The spelling of 80185139 in words is "eighty million, one hundred eighty-five thousand, one hundred thirty-nine".