43648321 has 2 divisors, whose sum is σ = 43648322. Its totient is φ = 43648320.

The previous prime is 43648247. The next prime is 43648327. The reversal of 43648321 is 12384634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37699600 + 5948721 = 6140^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 43648321 - 2⁷ = 43648193 is a prime.

It is a super-2 number, since 2×43648321² = 3810351852238082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43648327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21824160 + 21824161.

It is an arithmetic number, because the mean of its divisors is an integer number (21824161).

Almost surely, 2^43648321 is an apocalyptic number.

It is an amenable number.

43648321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43648321 is an equidigital number, since it uses as much as digits as its factorization.

43648321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 31.

The square root of 43648321 is about 6606.6875966705. The cubic root of 43648321 is about 352.0917487463.

The spelling of 43648321 in words is "forty-three million, six hundred forty-eight thousand, three hundred twenty-one".