43453121 has 4 divisors (see below), whose sum is σ = 43467732. Its totient is φ = 43438512.

The previous prime is 43453099. The next prime is 43453127. The reversal of 43453121 is 12135434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34058896 + 9394225 = 5836^2 + 3065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43453121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43453127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070 + ... + 9383.

It is an arithmetic number, because the mean of its divisors is an integer number (10866933).

Almost surely, 2^43453121 is an apocalyptic number.

It is an amenable number.

43453121 is a deficient number, since it is larger than the sum of its proper divisors (14611).

43453121 is a wasteful number, since it uses less digits than its factorization.

43453121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14610.

The product of its digits is 1440, while the sum is 23.

The square root of 43453121 is about 6591.8981333149. The cubic root of 43453121 is about 351.5661002864.

Adding to 43453121 its reverse (12135434), we get a palindrome (55588555).

The spelling of 43453121 in words is "forty-three million, four hundred fifty-three thousand, one hundred twenty-one".