43449121 has 2 divisors, whose sum is σ = 43449122. Its totient is φ = 43449120.

The previous prime is 43449083. The next prime is 43449151. The reversal of 43449121 is 12194434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30747025 + 12702096 = 5545^2 + 3564^2 .

It is a cyclic number.

It is not a de Polignac number, because 43449121 - 2⁹ = 43448609 is a prime.

It is a super-2 number, since 2×43449121² = 3775652231345282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43449121.

It is not a weakly prime, because it can be changed into another prime (43449151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21724560 + 21724561.

It is an arithmetic number, because the mean of its divisors is an integer number (21724561).

Almost surely, 2^43449121 is an apocalyptic number.

It is an amenable number.

43449121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43449121 is an equidigital number, since it uses as much as digits as its factorization.

43449121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 43449121 is about 6591.5947235855. The cubic root of 43449121 is about 351.5553123574. Note that the first 3 decimals are identical.

The spelling of 43449121 in words is "forty-three million, four hundred forty-nine thousand, one hundred twenty-one".