55387251 has 12 divisors (see below), whose sum is σ = 80302560. Its totient is φ = 36786960.

The previous prime is 55387247. The next prime is 55387259. The reversal of 55387251 is 15278355.

55387251 is a `hidden beast` number, since 5 + 538 + 72 + 51 = 666.

55387251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55387251 - 2² = 55387247 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55387259) 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, 8916 + ... + 13793.

It is an arithmetic number, because the mean of its divisors is an integer number (6691880).

Almost surely, 2^55387251 is an apocalyptic number.

55387251 is a deficient number, since it is larger than the sum of its proper divisors (24915309).

55387251 is a wasteful number, since it uses less digits than its factorization.

55387251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22986 (or 22983 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 55387251 is about 7442.2611483339. The cubic root of 55387251 is about 381.1857031766.

The spelling of 55387251 in words is "fifty-five million, three hundred eighty-seven thousand, two hundred fifty-one".