553665121 has 4 divisors (see below), whose sum is σ = 553782292. Its totient is φ = 553547952.

The previous prime is 553665113. The next prime is 553665143. The reversal of 553665121 is 121566355.

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 157854096 + 395811025 = 12564^2 + 19895^2 .

It is a cyclic number.

It is not a de Polignac number, because 553665121 - 2³ = 553665113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (553675121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51186 + ... + 61051.

It is an arithmetic number, because the mean of its divisors is an integer number (138445573).

Almost surely, 2^553665121 is an apocalyptic number.

It is an amenable number.

553665121 is a deficient number, since it is larger than the sum of its proper divisors (117171).

553665121 is a wasteful number, since it uses less digits than its factorization.

553665121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117170.

The product of its digits is 27000, while the sum is 34.

The square root of 553665121 is about 23530.0896938367. The cubic root of 553665121 is about 821.1371893013.

The spelling of 553665121 in words is "five hundred fifty-three million, six hundred sixty-five thousand, one hundred twenty-one".