51520055 has 4 divisors (see below), whose sum is σ = 61824072. Its totient is φ = 41216040.

The previous prime is 51520043. The next prime is 51520093. The reversal of 51520055 is 55002515.

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

It is not a de Polignac number, because 51520055 - 2⁶ = 51519991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51520055.

It is a congruent number.

It is an unprimeable number.

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, 5152001 + ... + 5152010.

It is an arithmetic number, because the mean of its divisors is an integer number (15456018).

Almost surely, 2^51520055 is an apocalyptic number.

51520055 is a deficient number, since it is larger than the sum of its proper divisors (10304017).

51520055 is a wasteful number, since it uses less digits than its factorization.

51520055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10304016.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 51520055 is about 7177.7472092572. The cubic root of 51520055 is about 372.0992311490.

The spelling of 51520055 in words is "fifty-one million, five hundred twenty thousand, fifty-five".