51309644 has 6 divisors (see below), whose sum is σ = 89791884. Its totient is φ = 25654820.

The previous prime is 51309637. The next prime is 51309647. The reversal of 51309644 is 44690315.

51309644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51309644.

It is not an unprimeable number, because it can be changed into a prime (51309647) 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 as a sum of consecutive naturals, namely, 6413702 + ... + 6413709.

It is an arithmetic number, because the mean of its divisors is an integer number (14965314).

Almost surely, 2^51309644 is an apocalyptic number.

It is an amenable number.

51309644 is a deficient number, since it is larger than the sum of its proper divisors (38482240).

51309644 is a wasteful number, since it uses less digits than its factorization.

51309644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12827415 (or 12827413 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 51309644 is about 7163.0750379987. The cubic root of 51309644 is about 371.5919814362.

Adding to 51309644 its reverse (44690315), we get a palindrome (95999959).

The spelling of 51309644 in words is "fifty-one million, three hundred nine thousand, six hundred forty-four".