43144561 has 2 divisors, whose sum is σ = 43144562. Its totient is φ = 43144560.

The previous prime is 43144559. The next prime is 43144579. The reversal of 43144561 is 16544134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 4704561 = 6200^2 + 2169^2 .

It is a cyclic number.

It is not a de Polignac number, because 43144561 - 2¹ = 43144559 is a prime.

It is a super-2 number, since 2×43144561² = 3722906287765442, which contains 22 as substring.

Together with 43144559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43144511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21572280 + 21572281.

It is an arithmetic number, because the mean of its divisors is an integer number (21572281).

Almost surely, 2^43144561 is an apocalyptic number.

It is an amenable number.

43144561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43144561 is an equidigital number, since it uses as much as digits as its factorization.

43144561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 43144561 is about 6568.4519485188. The cubic root of 43144561 is about 350.7319674630.

Adding to 43144561 its reverse (16544134), we get a palindrome (59688695).

The spelling of 43144561 in words is "forty-three million, one hundred forty-four thousand, five hundred sixty-one".