51870055 has 4 divisors (see below), whose sum is σ = 62244072. Its totient is φ = 41496040.

The previous prime is 51869977. The next prime is 51870059. The reversal of 51870055 is 55007815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55007815 = 5 ⋅11001563.

It is not a de Polignac number, because 51870055 - 2¹³ = 51861863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51869999 and 51870026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51870059) 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, 5187001 + ... + 5187010.

It is an arithmetic number, because the mean of its divisors is an integer number (15561018).

Almost surely, 2^51870055 is an apocalyptic number.

51870055 is a deficient number, since it is larger than the sum of its proper divisors (10374017).

51870055 is a wasteful number, since it uses less digits than its factorization.

51870055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374016.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 51870055 is about 7202.0868503511. The cubic root of 51870055 is about 372.9399453372.

The spelling of 51870055 in words is "fifty-one million, eight hundred seventy thousand, fifty-five".