51326643 has 4 divisors (see below), whose sum is σ = 68435528. Its totient is φ = 34217760.

The previous prime is 51326633. The next prime is 51326647. The reversal of 51326643 is 34662315.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51326643 - 2⁹ = 51326131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51326643.

It is not an unprimeable number, because it can be changed into a prime (51326647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8554438 + ... + 8554443.

It is an arithmetic number, because the mean of its divisors is an integer number (17108882).

Almost surely, 2^51326643 is an apocalyptic number.

51326643 is a deficient number, since it is larger than the sum of its proper divisors (17108885).

51326643 is a wasteful number, since it uses less digits than its factorization.

51326643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17108884.

The product of its digits is 12960, while the sum is 30.

The square root of 51326643 is about 7164.2615111399. The cubic root of 51326643 is about 371.6330133238.

Adding to 51326643 its reverse (34662315), we get a palindrome (85988958).

The spelling of 51326643 in words is "fifty-one million, three hundred twenty-six thousand, six hundred forty-three".