31343443 has 2 divisors, whose sum is σ = 31343444. Its totient is φ = 31343442.

The previous prime is 31343441. The next prime is 31343489. The reversal of 31343443 is 34434313.

It is a weak prime.

It is an emirp because it is prime and its reverse (34434313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31343443 - 2¹ = 31343441 is a prime.

It is a super-2 number, since 2×31343443² = 1964822838188498, which contains 22 as substring.

Together with 31343441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31343441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671721 + 15671722.

It is an arithmetic number, because the mean of its divisors is an integer number (15671722).

Almost surely, 2^31343443 is an apocalyptic number.

31343443 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343443 is an equidigital number, since it uses as much as digits as its factorization.

31343443 is an evil number, because the sum of its binary digits is even.

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

The square root of 31343443 is about 5598.5215012537. The cubic root of 31343443 is about 315.2938988789.

Adding to 31343443 its reverse (34434313), we get a palindrome (65777756).

The spelling of 31343443 in words is "thirty-one million, three hundred forty-three thousand, four hundred forty-three".