51305897 has 2 divisors, whose sum is σ = 51305898. Its totient is φ = 51305896.

The previous prime is 51305861. The next prime is 51305921. The reversal of 51305897 is 79850315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47389456 + 3916441 = 6884^2 + 1979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51305897 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51305897.

It is not a weakly prime, because it can be changed into another prime (51305197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25652948 + 25652949.

It is an arithmetic number, because the mean of its divisors is an integer number (25652949).

Almost surely, 2^51305897 is an apocalyptic number.

It is an amenable number.

51305897 is a deficient number, since it is larger than the sum of its proper divisors (1).

51305897 is an equidigital number, since it uses as much as digits as its factorization.

51305897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 51305897 is about 7162.8134835412. The cubic root of 51305897 is about 371.5829357745.

The spelling of 51305897 in words is "fifty-one million, three hundred five thousand, eight hundred ninety-seven".