43135121 has 2 divisors, whose sum is σ = 43135122. Its totient is φ = 43135120.

The previous prime is 43135109. The next prime is 43135123. The reversal of 43135121 is 12153134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 1661521 = 6440^2 + 1289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43135121 is a prime.

It is a Sophie Germain prime.

Together with 43135123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43135093 and 43135102.

It is not a weakly prime, because it can be changed into another prime (43135123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21567560 + 21567561.

It is an arithmetic number, because the mean of its divisors is an integer number (21567561).

Almost surely, 2^43135121 is an apocalyptic number.

It is an amenable number.

43135121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43135121 is an equidigital number, since it uses as much as digits as its factorization.

43135121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 43135121 is about 6567.7333228443. The cubic root of 43135121 is about 350.7063856268.

Adding to 43135121 its reverse (12153134), we get a palindrome (55288255).

The spelling of 43135121 in words is "forty-three million, one hundred thirty-five thousand, one hundred twenty-one".