51391975 has 6 divisors (see below), whose sum is σ = 63726080. Its totient is φ = 41113560.

The previous prime is 51391937. The next prime is 51392027. The reversal of 51391975 is 57919315.

51391975 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 51391975 - 2¹⁷ = 51260903 is a prime.

It is a super-2 number, since 2×51391975² = 5282270188801250, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 1027815 + ... + 1027864.

Almost surely, 2^51391975 is an apocalyptic number.

51391975 is a deficient number, since it is larger than the sum of its proper divisors (12334105).

51391975 is a wasteful number, since it uses less digits than its factorization.

51391975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055689 (or 2055684 counting only the distinct ones).

The product of its digits is 42525, while the sum is 40.

The square root of 51391975 is about 7168.8196378483. The cubic root of 51391975 is about 371.7906262928.

The spelling of 51391975 in words is "fifty-one million, three hundred ninety-one thousand, nine hundred seventy-five".