43821881 has 2 divisors, whose sum is σ = 43821882. Its totient is φ = 43821880.

The previous prime is 43821857. The next prime is 43821887. The reversal of 43821881 is 18812834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35295481 + 8526400 = 5941^2 + 2920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43821881 is a prime.

It is a super-2 number, since 2×43821881² = 3840714508756322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43821887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21910940 + 21910941.

It is an arithmetic number, because the mean of its divisors is an integer number (21910941).

Almost surely, 2^43821881 is an apocalyptic number.

It is an amenable number.

43821881 is a deficient number, since it is larger than the sum of its proper divisors (1).

43821881 is an equidigital number, since it uses as much as digits as its factorization.

43821881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 35.

The square root of 43821881 is about 6619.8097404684. The cubic root of 43821881 is about 352.5578088715.

The spelling of 43821881 in words is "forty-three million, eight hundred twenty-one thousand, eight hundred eighty-one".