818231609 has 8 divisors (see below), whose sum is σ = 882931392. Its totient is φ = 753783120.

The previous prime is 818231597. The next prime is 818231611. The reversal of 818231609 is 906132818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 818231609 - 2¹² = 818227513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818233609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56027 + ... + 69104.

It is an arithmetic number, because the mean of its divisors is an integer number (110366424).

Almost surely, 2^818231609 is an apocalyptic number.

It is an amenable number.

818231609 is a deficient number, since it is larger than the sum of its proper divisors (64699783).

818231609 is a wasteful number, since it uses less digits than its factorization.

818231609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125647.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 818231609 is about 28604.7480149712. The cubic root of 818231609 is about 935.3168339165.

The spelling of 818231609 in words is "eight hundred eighteen million, two hundred thirty-one thousand, six hundred nine".