231213841 has 4 divisors (see below), whose sum is σ = 238672384. Its totient is φ = 223755300.

The previous prime is 231213833. The next prime is 231213859. The reversal of 231213841 is 148312132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231213841 - 2³ = 231213833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231213041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3729225 + ... + 3729286.

It is an arithmetic number, because the mean of its divisors is an integer number (59668096).

Almost surely, 2^231213841 is an apocalyptic number.

It is an amenable number.

231213841 is a deficient number, since it is larger than the sum of its proper divisors (7458543).

231213841 is an equidigital number, since it uses as much as digits as its factorization.

231213841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7458542.

The product of its digits is 1152, while the sum is 25.

The square root of 231213841 is about 15205.7173786704. The cubic root of 231213841 is about 613.7685194822.

Adding to 231213841 its reverse (148312132), we get a palindrome (379525973).

It can be divided in two parts, 23121 and 3841, that added together give a palindrome (26962).

The spelling of 231213841 in words is "two hundred thirty-one million, two hundred thirteen thousand, eight hundred forty-one".