51807481 has 6 divisors (see below), whose sum is σ = 56945546. Its totient is φ = 47097600.

The previous prime is 51807473. The next prime is 51807499. The reversal of 51807481 is 18470815.

51807481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 37405456 + 14402025 = 6116^2 + 3795^2 .

It is not a de Polignac number, because 51807481 - 2³ = 51807473 is a prime.

It is a super-2 number, since 2×51807481² = 5368030175130722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51807451) 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 5 ways as a sum of consecutive naturals, for example, 213960 + ... + 214201.

Almost surely, 2^51807481 is an apocalyptic number.

It is an amenable number.

51807481 is a deficient number, since it is larger than the sum of its proper divisors (5138065).

51807481 is a wasteful number, since it uses less digits than its factorization.

51807481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428183 (or 428172 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 51807481 is about 7197.7413818503. The cubic root of 51807481 is about 372.7899182844.

The spelling of 51807481 in words is "fifty-one million, eight hundred seven thousand, four hundred eighty-one".