31223400343 has 2 divisors, whose sum is σ = 31223400344. Its totient is φ = 31223400342.

The previous prime is 31223400311. The next prime is 31223400409. The reversal of 31223400343 is 34300432213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31223400343 - 2⁵ = 31223400311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223400643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611700171 + 15611700172.

It is an arithmetic number, because the mean of its divisors is an integer number (15611700172).

Almost surely, 2^31223400343 is an apocalyptic number.

31223400343 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223400343 is an equidigital number, since it uses as much as digits as its factorization.

31223400343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 31223400343 its reverse (34300432213), we get a palindrome (65523832556).

The spelling of 31223400343 in words is "thirty-one billion, two hundred twenty-three million, four hundred thousand, three hundred forty-three".