51147457 has 2 divisors, whose sum is σ = 51147458. Its totient is φ = 51147456.

The previous prime is 51147403. The next prime is 51147497. The reversal of 51147457 is 75474115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43441281 + 7706176 = 6591^2 + 2776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51147457 is a prime.

It is not a weakly prime, because it can be changed into another prime (51147497) 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, 25573728 + 25573729.

It is an arithmetic number, because the mean of its divisors is an integer number (25573729).

Almost surely, 2^51147457 is an apocalyptic number.

It is an amenable number.

51147457 is a deficient number, since it is larger than the sum of its proper divisors (1).

51147457 is an equidigital number, since it uses as much as digits as its factorization.

51147457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19600, while the sum is 34.

The square root of 51147457 is about 7151.7450318087. The cubic root of 51147457 is about 371.2000408159.

The spelling of 51147457 in words is "fifty-one million, one hundred forty-seven thousand, four hundred fifty-seven".