80125709 has 4 divisors (see below), whose sum is σ = 84839004. Its totient is φ = 75412416.

The previous prime is 80125691. The next prime is 80125711. The reversal of 80125709 is 90752108.

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 75307684 + 4818025 = 8678^2 + 2195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80125709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80125909) 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, 2356622 + ... + 2356655.

It is an arithmetic number, because the mean of its divisors is an integer number (21209751).

Almost surely, 2^80125709 is an apocalyptic number.

It is an amenable number.

80125709 is a deficient number, since it is larger than the sum of its proper divisors (4713295).

80125709 is a wasteful number, since it uses less digits than its factorization.

80125709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4713294.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 80125709 is about 8951.2964982733. The cubic root of 80125709 is about 431.1125130862.

The spelling of 80125709 in words is "eighty million, one hundred twenty-five thousand, seven hundred nine".