43031213 has 2 divisors, whose sum is σ = 43031214. Its totient is φ = 43031212.

The previous prime is 43031207. The next prime is 43031243. The reversal of 43031213 is 31213034.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40729924 + 2301289 = 6382^2 + 1517^2 .

It is a cyclic number.

It is not a de Polignac number, because 43031213 - 2⁸ = 43030957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43031191 and 43031200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43031243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21515606 + 21515607.

It is an arithmetic number, because the mean of its divisors is an integer number (21515607).

Almost surely, 2^43031213 is an apocalyptic number.

It is an amenable number.

43031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

43031213 is an equidigital number, since it uses as much as digits as its factorization.

43031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 43031213 is about 6559.8180615014. The cubic root of 43031213 is about 350.4245541902.

Adding to 43031213 its reverse (31213034), we get a palindrome (74244247).

The spelling of 43031213 in words is "forty-three million, thirty-one thousand, two hundred thirteen".