31212343 has 2 divisors, whose sum is σ = 31212344. Its totient is φ = 31212342.

The previous prime is 31212341. The next prime is 31212359. The reversal of 31212343 is 34321213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31212343 - 2¹ = 31212341 is a prime.

Together with 31212341, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31212343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606171 + 15606172.

It is an arithmetic number, because the mean of its divisors is an integer number (15606172).

Almost surely, 2^31212343 is an apocalyptic number.

31212343 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212343 is an equidigital number, since it uses as much as digits as its factorization.

31212343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 31212343 is about 5586.8007839908. The cubic root of 31212343 is about 314.8536920280.

Adding to 31212343 its reverse (34321213), we get a palindrome (65533556).

The spelling of 31212343 in words is "thirty-one million, two hundred twelve thousand, three hundred forty-three".