80785109 has 4 divisors (see below), whose sum is σ = 81014316. Its totient is φ = 80555904.

The previous prime is 80785099. The next prime is 80785147. The reversal of 80785109 is 90158708.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36602500 + 44182609 = 6050^2 + 6647^2 .

It is a cyclic number.

It is not a de Polignac number, because 80785109 - 2¹² = 80781013 is a prime.

It is a super-2 number, since 2×80785109² = 13052467672283762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80785009) 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, 114074 + ... + 114779.

It is an arithmetic number, because the mean of its divisors is an integer number (20253579).

Almost surely, 2^80785109 is an apocalyptic number.

It is an amenable number.

80785109 is a deficient number, since it is larger than the sum of its proper divisors (229207).

80785109 is a wasteful number, since it uses less digits than its factorization.

80785109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229206.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 80785109 is about 8988.0536825277. The cubic root of 80785109 is about 432.2919069776.

The spelling of 80785109 in words is "eighty million, seven hundred eighty-five thousand, one hundred nine".