135043121 has 4 divisors (see below), whose sum is σ = 142986852. Its totient is φ = 127099392.

The previous prime is 135043093. The next prime is 135043133. The reversal of 135043121 is 121340531.

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 61701025 + 73342096 = 7855^2 + 8564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135043121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135043093 and 135043102.

It is not an unprimeable number, because it can be changed into a prime (135043141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3971840 + ... + 3971873.

It is an arithmetic number, because the mean of its divisors is an integer number (35746713).

Almost surely, 2^135043121 is an apocalyptic number.

It is an amenable number.

135043121 is a deficient number, since it is larger than the sum of its proper divisors (7943731).

135043121 is an equidigital number, since it uses as much as digits as its factorization.

135043121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7943730.

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

The square root of 135043121 is about 11620.8055228543. The cubic root of 135043121 is about 513.0473973537.

Adding to 135043121 its reverse (121340531), we get a palindrome (256383652).

The spelling of 135043121 in words is "one hundred thirty-five million, forty-three thousand, one hundred twenty-one".