828117309 has 4 divisors (see below), whose sum is σ = 1104156416. Its totient is φ = 552078204.

The previous prime is 828117293. The next prime is 828117341. The reversal of 828117309 is 903711828.

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 not a de Polignac number, because 828117309 - 2⁴ = 828117293 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 (828117709) 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, 138019549 + ... + 138019554.

It is an arithmetic number, because the mean of its divisors is an integer number (276039104).

Almost surely, 2^828117309 is an apocalyptic number.

It is an amenable number.

828117309 is a deficient number, since it is larger than the sum of its proper divisors (276039107).

828117309 is a wasteful number, since it uses less digits than its factorization.

828117309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276039106.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 828117309 is about 28777.0274524663. The cubic root of 828117309 is about 939.0685314173.

The spelling of 828117309 in words is "eight hundred twenty-eight million, one hundred seventeen thousand, three hundred nine".