51316243 has 32 divisors (see below), whose sum is σ = 61585920. Its totient is φ = 42282240.

The previous prime is 51316241. The next prime is 51316259. The reversal of 51316243 is 34261315.

It is not a de Polignac number, because 51316243 - 2¹ = 51316241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51316241) 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 31 ways as a sum of consecutive naturals, for example, 576543 + ... + 576631.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^51316243 is an apocalyptic number.

51316243 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

51316243 is a deficient number, since it is larger than the sum of its proper divisors (10269677).

51316243 is a wasteful number, since it uses less digits than its factorization.

51316243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219.

The product of its digits is 2160, while the sum is 25.

The square root of 51316243 is about 7163.5356493843. The cubic root of 51316243 is about 371.6079110625.

Adding to 51316243 its reverse (34261315), we get a palindrome (85577558).

The spelling of 51316243 in words is "fifty-one million, three hundred sixteen thousand, two hundred forty-three".