51487975 has 36 divisors (see below), whose sum is σ = 81041688. Its totient is φ = 32088000.

The previous prime is 51487939. The next prime is 51487981. The reversal of 51487975 is 57978415.

It is a happy number.

51487975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51487975 - 2⁹ = 51487463 is a prime.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 11565 + ... + 15385.

It is an arithmetic number, because the mean of its divisors is an integer number (2251158).

Almost surely, 2^51487975 is an apocalyptic number.

51487975 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51487975 is a deficient number, since it is larger than the sum of its proper divisors (29553713).

51487975 is a wasteful number, since it uses less digits than its factorization.

51487975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856 (or 3844 counting only the distinct ones).

The product of its digits is 352800, while the sum is 46.

The square root of 51487975 is about 7175.5121768415. The cubic root of 51487975 is about 372.0219834197.

The spelling of 51487975 in words is "fifty-one million, four hundred eighty-seven thousand, nine hundred seventy-five".