55530551 has 4 divisors (see below), whose sum is σ = 58797072. Its totient is φ = 52264032.

The previous prime is 55530529. The next prime is 55530577. The reversal of 55530551 is 15503555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55530551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55530511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1633235 + ... + 1633268.

It is an arithmetic number, because the mean of its divisors is an integer number (14699268).

Almost surely, 2^55530551 is an apocalyptic number.

55530551 is a deficient number, since it is larger than the sum of its proper divisors (3266521).

55530551 is a wasteful number, since it uses less digits than its factorization.

55530551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266520.

The product of its (nonzero) digits is 9375, while the sum is 29.

The square root of 55530551 is about 7451.8823796407. The cubic root of 55530551 is about 381.5141594521.

The spelling of 55530551 in words is "fifty-five million, five hundred thirty thousand, five hundred fifty-one".