553136621 has 2 divisors, whose sum is σ = 553136622. Its totient is φ = 553136620.

The previous prime is 553136587. The next prime is 553136629. The reversal of 553136621 is 126631355.

553136621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492218596 + 60918025 = 22186^2 + 7805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-553136621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553136629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276568310 + 276568311.

It is an arithmetic number, because the mean of its divisors is an integer number (276568311).

Almost surely, 2^553136621 is an apocalyptic number.

It is an amenable number.

553136621 is a deficient number, since it is larger than the sum of its proper divisors (1).

553136621 is an equidigital number, since it uses as much as digits as its factorization.

553136621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 553136621 is about 23518.8567111584. The cubic root of 553136621 is about 820.8758344718.

Adding to 553136621 its reverse (126631355), we get a palindrome (679767976).

The spelling of 553136621 in words is "five hundred fifty-three million, one hundred thirty-six thousand, six hundred twenty-one".