51855505 has 16 divisors (see below), whose sum is σ = 67273920. Its totient is φ = 38144448.

The previous prime is 51855499. The next prime is 51855511. The reversal of 51855505 is 50555815.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51855499) and next prime (51855511).

It is a cyclic number.

It is not a de Polignac number, because 51855505 - 2⁵ = 51855473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16986 + ... + 19804.

It is an arithmetic number, because the mean of its divisors is an integer number (4204620).

Almost surely, 2^51855505 is an apocalyptic number.

It is an amenable number.

51855505 is a deficient number, since it is larger than the sum of its proper divisors (15418415).

51855505 is a wasteful number, since it uses less digits than its factorization.

51855505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120.

The product of its (nonzero) digits is 25000, while the sum is 34.

The square root of 51855505 is about 7201.0766556120. The cubic root of 51855505 is about 372.9050711138.

The spelling of 51855505 in words is "fifty-one million, eight hundred fifty-five thousand, five hundred five".