51506055 has 48 divisors (see below), whose sum is σ = 95022720. Its totient is φ = 25735104.

The previous prime is 51506053. The next prime is 51506057. The reversal of 51506055 is 55060515.

51506055 is a `hidden beast` number, since 5 + 1 + 50 + 605 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (51506053) and next prime (51506057).

It is not a de Polignac number, because 51506055 - 2¹ = 51506053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51506051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91204 + ... + 91766.

It is an arithmetic number, because the mean of its divisors is an integer number (1979640).

Almost surely, 2^51506055 is an apocalyptic number.

51506055 is a deficient number, since it is larger than the sum of its proper divisors (43516665).

51506055 is a wasteful number, since it uses less digits than its factorization.

51506055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 51506055 is about 7176.7719066444. The cubic root of 51506055 is about 372.0655234911.

The spelling of 51506055 in words is "fifty-one million, five hundred six thousand, fifty-five".