51159397 has 2 divisors, whose sum is σ = 51159398. Its totient is φ = 51159396.

The previous prime is 51159323. The next prime is 51159403. The reversal of 51159397 is 79395115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36650916 + 14508481 = 6054^2 + 3809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51159397 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 (51159497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25579698 + 25579699.

It is an arithmetic number, because the mean of its divisors is an integer number (25579699).

Almost surely, 2^51159397 is an apocalyptic number.

It is an amenable number.

51159397 is a deficient number, since it is larger than the sum of its proper divisors (1).

51159397 is an equidigital number, since it uses as much as digits as its factorization.

51159397 is an odious number, because the sum of its binary digits is odd.

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

The square root of 51159397 is about 7152.5797443999. The cubic root of 51159397 is about 371.2289232140.

The spelling of 51159397 in words is "fifty-one million, one hundred fifty-nine thousand, three hundred ninety-seven".