43121345 has 8 divisors (see below), whose sum is σ = 52093800. Its totient is φ = 34264960.

The previous prime is 43121339. The next prime is 43121363. The reversal of 43121345 is 54312134.

43121345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1763584 + 41357761 = 1328^2 + 6431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43121345 - 2⁴ = 43121329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43121345.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 28196 + ... + 29685.

It is an arithmetic number, because the mean of its divisors is an integer number (6511725).

Almost surely, 2^43121345 is an apocalyptic number.

It is an amenable number.

43121345 is a deficient number, since it is larger than the sum of its proper divisors (8972455).

43121345 is a wasteful number, since it uses less digits than its factorization.

43121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58035.

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

The square root of 43121345 is about 6566.6844754412. The cubic root of 43121345 is about 350.6690467911.

Adding to 43121345 its reverse (54312134), we get a palindrome (97433479).

The spelling of 43121345 in words is "forty-three million, one hundred twenty-one thousand, three hundred forty-five".