231967009 has 4 divisors (see below), whose sum is σ = 232048516. Its totient is φ = 231885504.

The previous prime is 231967007. The next prime is 231967013. The reversal of 231967009 is 900769132.

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 102576384 + 129390625 = 10128^2 + 11375^2 .

It is a cyclic number.

It is not a de Polignac number, because 231967009 - 2¹ = 231967007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231967007) 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 3 ways as a sum of consecutive naturals, for example, 36324 + ... + 42229.

It is an arithmetic number, because the mean of its divisors is an integer number (58012129).

Almost surely, 2^231967009 is an apocalyptic number.

It is an amenable number.

231967009 is a deficient number, since it is larger than the sum of its proper divisors (81507).

231967009 is an equidigital number, since it uses as much as digits as its factorization.

231967009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81506.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 231967009 is about 15230.4631905927. The cubic root of 231967009 is about 614.4342376632.

The spelling of 231967009 in words is "two hundred thirty-one million, nine hundred sixty-seven thousand, nine".