231340427 has 4 divisors (see below), whose sum is σ = 231399480. Its totient is φ = 231281376.

The previous prime is 231340397. The next prime is 231340429. The reversal of 231340427 is 724043132.

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 231340427 - 2⁸ = 231340171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231340396 and 231340405.

It is not an unprimeable number, because it can be changed into a prime (231340429) 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, 23198 + ... + 31635.

It is an arithmetic number, because the mean of its divisors is an integer number (57849870).

Almost surely, 2^231340427 is an apocalyptic number.

231340427 is a deficient number, since it is larger than the sum of its proper divisors (59053).

231340427 is an equidigital number, since it uses as much as digits as its factorization.

231340427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59052.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 231340427 is about 15209.8792565885. The cubic root of 231340427 is about 613.8805086361.

Adding to 231340427 its reverse (724043132), we get a palindrome (955383559).

The spelling of 231340427 in words is "two hundred thirty-one million, three hundred forty thousand, four hundred twenty-seven".