823951609 has 16 divisors (see below), whose sum is σ = 929964672. Its totient is φ = 724318848.

The previous prime is 823951607. The next prime is 823951627. The reversal of 823951609 is 906159328.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 823951609 - 2¹ = 823951607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (823951603) 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 15 ways as a sum of consecutive naturals, for example, 63754 + ... + 75580.

It is an arithmetic number, because the mean of its divisors is an integer number (58122792).

Almost surely, 2^823951609 is an apocalyptic number.

It is an amenable number.

823951609 is a deficient number, since it is larger than the sum of its proper divisors (106013063).

823951609 is a wasteful number, since it uses less digits than its factorization.

823951609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12096.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 823951609 is about 28704.5572862568. The cubic root of 823951609 is about 937.4912768136.

The spelling of 823951609 in words is "eight hundred twenty-three million, nine hundred fifty-one thousand, six hundred nine".