229631509 has 4 divisors (see below), whose sum is σ = 235837804. Its totient is φ = 223425216.

The previous prime is 229631453. The next prime is 229631531. The reversal of 229631509 is 905136922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110712484 + 118919025 = 10522^2 + 10905^2 .

It is a cyclic number.

It is not a de Polignac number, because 229631509 - 2⁹ = 229630997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 6206257 = 229631509 / (2 + 2 + 9 + 6 + 3 + 1 + 5 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229635509) 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 in 3 ways as a sum of consecutive naturals, for example, 3103092 + ... + 3103165.

It is an arithmetic number, because the mean of its divisors is an integer number (58959451).

Almost surely, 2^229631509 is an apocalyptic number.

It is an amenable number.

229631509 is a deficient number, since it is larger than the sum of its proper divisors (6206295).

229631509 is an equidigital number, since it uses as much as digits as its factorization.

229631509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6206294.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 229631509 is about 15153.5972297009. The cubic root of 229631509 is about 612.3651872670.

The spelling of 229631509 in words is "two hundred twenty-nine million, six hundred thirty-one thousand, five hundred nine".