82500009 has 4 divisors (see below), whose sum is σ = 110000016. Its totient is φ = 55000004.

The previous prime is 82499987. The next prime is 82500017. The reversal of 82500009 is 90000528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82500009 - 2⁹ = 82499497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82500059) 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, 13749999 + ... + 13750004.

It is an arithmetic number, because the mean of its divisors is an integer number (27500004).

Almost surely, 2^82500009 is an apocalyptic number.

It is an amenable number.

82500009 is a deficient number, since it is larger than the sum of its proper divisors (27500007).

82500009 is a wasteful number, since it uses less digits than its factorization.

82500009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27500006.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 82500009 is about 9082.9515577262. The cubic root of 82500009 is about 435.3294003888.

The spelling of 82500009 in words is "eighty-two million, five hundred thousand, nine".