43871213 has 2 divisors, whose sum is σ = 43871214. Its totient is φ = 43871212.

The previous prime is 43871207. The next prime is 43871249. The reversal of 43871213 is 31217834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32058244 + 11812969 = 5662^2 + 3437^2 .

It is a cyclic number.

It is not a de Polignac number, because 43871213 - 2¹⁴ = 43854829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43871263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21935606 + 21935607.

It is an arithmetic number, because the mean of its divisors is an integer number (21935607).

Almost surely, 2^43871213 is an apocalyptic number.

It is an amenable number.

43871213 is a deficient number, since it is larger than the sum of its proper divisors (1).

43871213 is an equidigital number, since it uses as much as digits as its factorization.

43871213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 43871213 is about 6623.5347813686. The cubic root of 43871213 is about 352.6900552827.

The spelling of 43871213 in words is "forty-three million, eight hundred seventy-one thousand, two hundred thirteen".