55216251 has 24 divisors (see below), whose sum is σ = 81423680. Its totient is φ = 36049536.

The previous prime is 55216243. The next prime is 55216253. The reversal of 55216251 is 15261255.

55216251 is a `hidden beast` number, since 552 + 1 + 62 + 51 = 666.

55216251 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 55216251 - 2³ = 55216243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55216253) 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 23 ways as a sum of consecutive naturals, for example, 150270 + ... + 150636.

Almost surely, 2^55216251 is an apocalyptic number.

55216251 is a deficient number, since it is larger than the sum of its proper divisors (26207429).

55216251 is a wasteful number, since it uses less digits than its factorization.

55216251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 672 counting only the distinct ones).

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

The square root of 55216251 is about 7430.7638234572. The cubic root of 55216251 is about 380.7930138237.

The spelling of 55216251 in words is "fifty-five million, two hundred sixteen thousand, two hundred fifty-one".