231411209 has 4 divisors (see below), whose sum is σ = 237665604. Its totient is φ = 225156816.

The previous prime is 231411181. The next prime is 231411217. The reversal of 231411209 is 902114132.

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 200364025 + 31047184 = 14155^2 + 5572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231411209 is a prime.

It is a super-2 number, since 2×231411209² = 107102295301683362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231411269) 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, 3127142 + ... + 3127215.

It is an arithmetic number, because the mean of its divisors is an integer number (59416401).

Almost surely, 2^231411209 is an apocalyptic number.

It is an amenable number.

231411209 is a deficient number, since it is larger than the sum of its proper divisors (6254395).

231411209 is an equidigital number, since it uses as much as digits as its factorization.

231411209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6254394.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 231411209 is about 15212.2059215618. The cubic root of 231411209 is about 613.9431108365.

The spelling of 231411209 in words is "two hundred thirty-one million, four hundred eleven thousand, two hundred nine".