51312644 has 6 divisors (see below), whose sum is σ = 89797134. Its totient is φ = 25656320.

The previous prime is 51312641. The next prime is 51312659. The reversal of 51312644 is 44621315.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 3564544 = 6910^2 + 1888^2 .

It is not an unprimeable number, because it can be changed into a prime (51312641) 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, 6414077 + ... + 6414084.

It is an arithmetic number, because the mean of its divisors is an integer number (14966189).

Almost surely, 2^51312644 is an apocalyptic number.

It is an amenable number.

51312644 is a deficient number, since it is larger than the sum of its proper divisors (38484490).

51312644 is a wasteful number, since it uses less digits than its factorization.

51312644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12828165 (or 12828163 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 51312644 is about 7163.2844422095. The cubic root of 51312644 is about 371.5992234420.

Adding to 51312644 its reverse (44621315), we get a palindrome (95933959).

The spelling of 51312644 in words is "fifty-one million, three hundred twelve thousand, six hundred forty-four".