51291797 has 2 divisors, whose sum is σ = 51291798. Its totient is φ = 51291796.

The previous prime is 51291791. The next prime is 51291847. The reversal of 51291797 is 79719215.

It is a happy number.

51291797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46771921 + 4519876 = 6839^2 + 2126^2 .

It is a cyclic number.

It is not a de Polignac number, because 51291797 - 2⁴ = 51291781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51291791) 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 as a sum of consecutive naturals, namely, 25645898 + 25645899.

It is an arithmetic number, because the mean of its divisors is an integer number (25645899).

Almost surely, 2^51291797 is an apocalyptic number.

It is an amenable number.

51291797 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291797 is an equidigital number, since it uses as much as digits as its factorization.

51291797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 41.

The square root of 51291797 is about 7161.8291657928. The cubic root of 51291797 is about 371.5488929078.

The spelling of 51291797 in words is "fifty-one million, two hundred ninety-one thousand, seven hundred ninety-seven".