231213443 has 2 divisors, whose sum is σ = 231213444. Its totient is φ = 231213442.

The previous prime is 231213439. The next prime is 231213461. The reversal of 231213443 is 344312132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231213443 - 2² = 231213439 is a prime.

It is not a weakly prime, because it can be changed into another prime (231213643) 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 as a sum of consecutive naturals, namely, 115606721 + 115606722.

It is an arithmetic number, because the mean of its divisors is an integer number (115606722).

Almost surely, 2^231213443 is an apocalyptic number.

231213443 is a deficient number, since it is larger than the sum of its proper divisors (1).

231213443 is an equidigital number, since it uses as much as digits as its factorization.

231213443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 23.

The square root of 231213443 is about 15205.7042914822. The cubic root of 231213443 is about 613.7681673118.

Adding to 231213443 its reverse (344312132), we get a palindrome (575525575).

The spelling of 231213443 in words is "two hundred thirty-one million, two hundred thirteen thousand, four hundred forty-three".