55125553 has 4 divisors (see below), whose sum is σ = 63000640. Its totient is φ = 47250468.

The previous prime is 55125547. The next prime is 55125557. The reversal of 55125553 is 35552155.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-55125553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55125557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3937533 + ... + 3937546.

It is an arithmetic number, because the mean of its divisors is an integer number (15750160).

Almost surely, 2^55125553 is an apocalyptic number.

It is an amenable number.

55125553 is a deficient number, since it is larger than the sum of its proper divisors (7875087).

55125553 is an equidigital number, since it uses as much as digits as its factorization.

55125553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7875086.

The product of its digits is 18750, while the sum is 31.

The square root of 55125553 is about 7424.6584433225. The cubic root of 55125553 is about 380.5844031845.

The spelling of 55125553 in words is "fifty-five million, one hundred twenty-five thousand, five hundred fifty-three".