51481819 has 4 divisors (see below), whose sum is σ = 51501096. Its totient is φ = 51462544.

The previous prime is 51481753. The next prime is 51481823. The reversal of 51481819 is 91818415.

51481819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51481819 - 2¹⁵ = 51449051 is a prime.

It is a super-2 number, since 2×51481819² = 5300755375097522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51481519) 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 3 ways as a sum of consecutive naturals, for example, 4834 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (12875274).

Almost surely, 2^51481819 is an apocalyptic number.

51481819 is a deficient number, since it is larger than the sum of its proper divisors (19277).

51481819 is a wasteful number, since it uses less digits than its factorization.

51481819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19276.

The product of its digits is 11520, while the sum is 37.

The square root of 51481819 is about 7175.0832050925. The cubic root of 51481819 is about 372.0071562773.

The spelling of 51481819 in words is "fifty-one million, four hundred eighty-one thousand, eight hundred nineteen".