231109609 has 2 divisors, whose sum is σ = 231109610. Its totient is φ = 231109608.

The previous prime is 231109603. The next prime is 231109639. The reversal of 231109609 is 906901132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180983209 + 50126400 = 13453^2 + 7080^2 .

It is a cyclic number.

It is not a de Polignac number, because 231109609 - 2¹⁷ = 230978537 is a prime.

It is not a weakly prime, because it can be changed into another prime (231109603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115554804 + 115554805.

It is an arithmetic number, because the mean of its divisors is an integer number (115554805).

Almost surely, 2^231109609 is an apocalyptic number.

It is an amenable number.

231109609 is a deficient number, since it is larger than the sum of its proper divisors (1).

231109609 is an equidigital number, since it uses as much as digits as its factorization.

231109609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 231109609 is about 15202.2895972942. The cubic root of 231109609 is about 613.6762759617.

The spelling of 231109609 in words is "two hundred thirty-one million, one hundred nine thousand, six hundred nine".