43454561 has 2 divisors, whose sum is σ = 43454562. Its totient is φ = 43454560.

The previous prime is 43454531. The next prime is 43454563. The reversal of 43454561 is 16545434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35473936 + 7980625 = 5956^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 43454561 - 2¹⁸ = 43192417 is a prime.

Together with 43454563, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (43454563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21727280 + 21727281.

It is an arithmetic number, because the mean of its divisors is an integer number (21727281).

Almost surely, 2^43454561 is an apocalyptic number.

It is an amenable number.

43454561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43454561 is an equidigital number, since it uses as much as digits as its factorization.

43454561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 32.

The square root of 43454561 is about 6592.0073573988. The cubic root of 43454561 is about 351.5699837788.

Adding to 43454561 its reverse (16545434), we get a palindrome (59999995).

The spelling of 43454561 in words is "forty-three million, four hundred fifty-four thousand, five hundred sixty-one".