63555121 has 4 divisors (see below), whose sum is σ = 72634432. Its totient is φ = 54475812.

The previous prime is 63555113. The next prime is 63555143. The reversal of 63555121 is 12155536.

63555121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63555121 - 2³ = 63555113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63555121.

It is not an unprimeable number, because it can be changed into a prime (63555101) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4539645 + ... + 4539658.

It is an arithmetic number, because the mean of its divisors is an integer number (18158608).

Almost surely, 2^63555121 is an apocalyptic number.

It is an amenable number.

63555121 is a deficient number, since it is larger than the sum of its proper divisors (9079311).

63555121 is an equidigital number, since it uses as much as digits as its factorization.

63555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9079310.

The product of its digits is 4500, while the sum is 28.

The square root of 63555121 is about 7972.1465741668. The cubic root of 63555121 is about 399.0710128776.

It can be divided in two parts, 6355 and 5121, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 63555121 in words is "sixty-three million, five hundred fifty-five thousand, one hundred twenty-one".