55125621 has 12 divisors (see below), whose sum is σ = 80521740. Its totient is φ = 36336960.

The previous prime is 55125619. The next prime is 55125659. The reversal of 55125621 is 12652155.

55125621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2852721 + 52272900 = 1689^2 + 7230^2 .

It is not a de Polignac number, because 55125621 - 2¹ = 55125619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55125601) 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 11 ways as a sum of consecutive naturals, for example, 33610 + ... + 35211.

It is an arithmetic number, because the mean of its divisors is an integer number (6710145).

Almost surely, 2^55125621 is an apocalyptic number.

It is an amenable number.

55125621 is a deficient number, since it is larger than the sum of its proper divisors (25396119).

55125621 is a wasteful number, since it uses less digits than its factorization.

55125621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68916 (or 68913 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 55125621 is about 7424.6630226563. The cubic root of 55125621 is about 380.5845596741.

Adding to 55125621 its reverse (12652155), we get a palindrome (67777776).

The spelling of 55125621 in words is "fifty-five million, one hundred twenty-five thousand, six hundred twenty-one".