231431227 has 4 divisors (see below), whose sum is σ = 231480216. Its totient is φ = 231382240.

The previous prime is 231431219. The next prime is 231431237. The reversal of 231431227 is 722134132.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 231431227 - 2³ = 231431219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231431237) 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, 16549 + ... + 27142.

It is an arithmetic number, because the mean of its divisors is an integer number (57870054).

Almost surely, 2^231431227 is an apocalyptic number.

231431227 is a deficient number, since it is larger than the sum of its proper divisors (48989).

231431227 is an equidigital number, since it uses as much as digits as its factorization.

231431227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48988.

The product of its digits is 2016, while the sum is 25.

The square root of 231431227 is about 15212.8638658209. The cubic root of 231431227 is about 613.9608131753.

Adding to 231431227 its reverse (722134132), we get a palindrome (953565359).

The spelling of 231431227 in words is "two hundred thirty-one million, four hundred thirty-one thousand, two hundred twenty-seven".