51393791 has 2 divisors, whose sum is σ = 51393792. Its totient is φ = 51393790.

The previous prime is 51393773. The next prime is 51393809. The reversal of 51393791 is 19739315.

It is a balanced prime because it is at equal distance from previous prime (51393773) and next prime (51393809).

It is a cyclic number.

It is not a de Polignac number, because 51393791 - 2¹⁰ = 51392767 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51393731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25696895 + 25696896.

It is an arithmetic number, because the mean of its divisors is an integer number (25696896).

Almost surely, 2^51393791 is an apocalyptic number.

51393791 is a deficient number, since it is larger than the sum of its proper divisors (1).

51393791 is an equidigital number, since it uses as much as digits as its factorization.

51393791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25515, while the sum is 38.

The square root of 51393791 is about 7168.9462963535. The cubic root of 51393791 is about 371.7950054708.

The spelling of 51393791 in words is "fifty-one million, three hundred ninety-three thousand, seven hundred ninety-one".