51245281 has 8 divisors (see below), whose sum is σ = 51891840. Its totient is φ = 50601792.

The previous prime is 51245273. The next prime is 51245309. The reversal of 51245281 is 18254215.

51245281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51245281 - 2³ = 51245273 is a prime.

It is a super-2 number, since 2×51245281² = 5252157649537922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51245881) 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 in 7 ways as a sum of consecutive naturals, for example, 60660 + ... + 61498.

It is an arithmetic number, because the mean of its divisors is an integer number (6486480).

Almost surely, 2^51245281 is an apocalyptic number.

It is an amenable number.

51245281 is a deficient number, since it is larger than the sum of its proper divisors (646559).

51245281 is a wasteful number, since it uses less digits than its factorization.

51245281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its digits is 3200, while the sum is 28.

The square root of 51245281 is about 7158.5809347943. The cubic root of 51245281 is about 371.4365409885.

Adding to 51245281 its reverse (18254215), we get a palindrome (69499496).

The spelling of 51245281 in words is "fifty-one million, two hundred forty-five thousand, two hundred eighty-one".