51457819 has 4 divisors (see below), whose sum is σ = 58808944. Its totient is φ = 44106696.

The previous prime is 51457811. The next prime is 51457823. The reversal of 51457819 is 91875415.

It is a happy number.

51457819 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, and also an emirpimes, since its reverse is a distinct semiprime: 91875415 = 5 ⋅18375083.

It is a cyclic number.

It is not a de Polignac number, because 51457819 - 2³ = 51457811 is a prime.

It is a super-2 number, since 2×51457819² = 5295814272473522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51457811) 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, 3675552 + ... + 3675565.

It is an arithmetic number, because the mean of its divisors is an integer number (14702236).

Almost surely, 2^51457819 is an apocalyptic number.

51457819 is a deficient number, since it is larger than the sum of its proper divisors (7351125).

51457819 is an equidigital number, since it uses as much as digits as its factorization.

51457819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7351124.

The product of its digits is 50400, while the sum is 40.

The square root of 51457819 is about 7173.4105556562. The cubic root of 51457819 is about 371.9493393647.

The spelling of 51457819 in words is "fifty-one million, four hundred fifty-seven thousand, eight hundred nineteen".