125809079 has 4 divisors (see below), whose sum is σ = 137246280. Its totient is φ = 114371880.

The previous prime is 125809069. The next prime is 125809081. The reversal of 125809079 is 970908521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125809079 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 (125809069) 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, 5718584 + ... + 5718605.

It is an arithmetic number, because the mean of its divisors is an integer number (34311570).

Almost surely, 2^125809079 is an apocalyptic number.

125809079 is a deficient number, since it is larger than the sum of its proper divisors (11437201).

125809079 is a wasteful number, since it uses less digits than its factorization.

125809079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11437200.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 125809079 is about 11216.4646390919. The cubic root of 125809079 is about 501.0764528355.

The spelling of 125809079 in words is "one hundred twenty-five million, eight hundred nine thousand, seventy-nine".