51298865 has 8 divisors (see below), whose sum is σ = 62568168. Its totient is φ = 40366080.

The previous prime is 51298861. The next prime is 51298867. The reversal of 51298865 is 56889215.

It can be written as a sum of positive squares in 4 ways, for example, as 1073296 + 50225569 = 1036^2 + 7087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51298865 - 2² = 51298861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51298861) 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 in 7 ways as a sum of consecutive naturals, for example, 83792 + ... + 84401.

It is an arithmetic number, because the mean of its divisors is an integer number (7821021).

Almost surely, 2^51298865 is an apocalyptic number.

It is an amenable number.

51298865 is a deficient number, since it is larger than the sum of its proper divisors (11269303).

51298865 is a wasteful number, since it uses less digits than its factorization.

51298865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168259.

The product of its digits is 172800, while the sum is 44.

The square root of 51298865 is about 7162.3225981521. The cubic root of 51298865 is about 371.5659585799.

The spelling of 51298865 in words is "fifty-one million, two hundred ninety-eight thousand, eight hundred sixty-five".