55250551 has 4 divisors (see below), whose sum is σ = 55266232. Its totient is φ = 55234872.

The previous prime is 55250549. The next prime is 55250557. The reversal of 55250551 is 15505255.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15505255 = 5 ⋅3101051.

It is a cyclic number.

It is not a de Polignac number, because 55250551 - 2¹ = 55250549 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 (55250557) 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, 181 + ... + 10513.

It is an arithmetic number, because the mean of its divisors is an integer number (13816558).

Almost surely, 2^55250551 is an apocalyptic number.

55250551 is a deficient number, since it is larger than the sum of its proper divisors (15681).

55250551 is a wasteful number, since it uses less digits than its factorization.

55250551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15680.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 55250551 is about 7433.0714378378. The cubic root of 55250551 is about 380.8718462723.

The spelling of 55250551 in words is "fifty-five million, two hundred fifty thousand, five hundred fifty-one".