51791481 has 30 divisors (see below), whose sum is σ = 90005850. Its totient is φ = 29592864.

The previous prime is 51791471. The next prime is 51791491. The reversal of 51791481 is 18419715.

51791481 is a `hidden beast` number, since 5 + 179 + 1 + 481 = 666.

51791481 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 (51791471) and next prime (51791491).

It can be written as a sum of positive squares in only one way, i.e., 45441081 + 6350400 = 6741^2 + 2520^2 .

It is not a de Polignac number, because 51791481 - 2⁵ = 51791449 is a prime.

It is a super-2 number, since 2×51791481² = 5364715008346722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51791431) 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 29 ways as a sum of consecutive naturals, for example, 2556 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (3000195).

Almost surely, 2^51791481 is an apocalyptic number.

It is an amenable number.

51791481 is a deficient number, since it is larger than the sum of its proper divisors (38214369).

51791481 is a wasteful number, since it uses less digits than its factorization.

51791481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13075 (or 13059 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 51791481 is about 7196.6298362497. The cubic root of 51791481 is about 372.7515373870.

The spelling of 51791481 in words is "fifty-one million, seven hundred ninety-one thousand, four hundred eighty-one".