43545389 has 2 divisors, whose sum is σ = 43545390. Its totient is φ = 43545388.

The previous prime is 43545373. The next prime is 43545401. The reversal of 43545389 is 98354534.

43545389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 4169764 = 6275^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 43545389 - 2⁴ = 43545373 is a prime.

It is a super-2 number, since 2×43545389² = 3792401806322642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43545349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21772694 + 21772695.

It is an arithmetic number, because the mean of its divisors is an integer number (21772695).

Almost surely, 2^43545389 is an apocalyptic number.

It is an amenable number.

43545389 is a deficient number, since it is larger than the sum of its proper divisors (1).

43545389 is an equidigital number, since it uses as much as digits as its factorization.

43545389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The square root of 43545389 is about 6598.8930132258. The cubic root of 43545389 is about 351.8147618900.

It can be divided in two parts, 43545 and 389, that added together give a palindrome (43934).

The spelling of 43545389 in words is "forty-three million, five hundred forty-five thousand, three hundred eighty-nine".