51855519 has 8 divisors (see below), whose sum is σ = 69322752. Its totient is φ = 34479320.

The previous prime is 51855511. The next prime is 51855527. The reversal of 51855519 is 91555815.

51855519 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51855511) and next prime (51855527).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51855519 - 2³ = 51855511 is a prime.

It is a super-2 number, since 2×51855519² = 5377989701518722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51855511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21417 + ... + 23714.

It is an arithmetic number, because the mean of its divisors is an integer number (8665344).

Almost surely, 2^51855519 is an apocalyptic number.

51855519 is a deficient number, since it is larger than the sum of its proper divisors (17467233).

51855519 is a wasteful number, since it uses less digits than its factorization.

51855519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45517.

The product of its digits is 45000, while the sum is 39.

The square root of 51855519 is about 7201.0776276888. The cubic root of 51855519 is about 372.9051046729.

The spelling of 51855519 in words is "fifty-one million, eight hundred fifty-five thousand, five hundred nineteen".