80851409 has 4 divisors (see below), whose sum is σ = 81652020. Its totient is φ = 80050800.

The previous prime is 80851363. The next prime is 80851411. The reversal of 80851409 is 90415808.

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 68227600 + 12623809 = 8260^2 + 3553^2 .

It is a cyclic number.

It is not a de Polignac number, because 80851409 - 2⁸ = 80851153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80851469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400154 + ... + 400355.

It is an arithmetic number, because the mean of its divisors is an integer number (20413005).

Almost surely, 2^80851409 is an apocalyptic number.

It is an amenable number.

80851409 is a deficient number, since it is larger than the sum of its proper divisors (800611).

80851409 is a wasteful number, since it uses less digits than its factorization.

80851409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800610.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 80851409 is about 8991.7411550823. The cubic root of 80851409 is about 432.4101346919.

The spelling of 80851409 in words is "eighty million, eight hundred fifty-one thousand, four hundred nine".