51075391 has 2 divisors, whose sum is σ = 51075392. Its totient is φ = 51075390.

The previous prime is 51075377. The next prime is 51075407. The reversal of 51075391 is 19357015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51075391 - 2⁵ = 51075359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51075301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25537695 + 25537696.

It is an arithmetic number, because the mean of its divisors is an integer number (25537696).

Almost surely, 2^51075391 is an apocalyptic number.

51075391 is a deficient number, since it is larger than the sum of its proper divisors (1).

51075391 is an equidigital number, since it uses as much as digits as its factorization.

51075391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 51075391 is about 7146.7049050594. The cubic root of 51075391 is about 371.0256204411.

The spelling of 51075391 in words is "fifty-one million, seventy-five thousand, three hundred ninety-one".