51312623 has 4 divisors (see below), whose sum is σ = 52035408. Its totient is φ = 50589840.

The previous prime is 51312617. The next prime is 51312637. The reversal of 51312623 is 32621315.

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

It is a cyclic number.

It is not a de Polignac number, because 51312623 - 2¹⁶ = 51247087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361286 + ... + 361427.

It is an arithmetic number, because the mean of its divisors is an integer number (13008852).

Almost surely, 2^51312623 is an apocalyptic number.

51312623 is a deficient number, since it is larger than the sum of its proper divisors (722785).

51312623 is an equidigital number, since it uses as much as digits as its factorization.

51312623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722784.

The product of its digits is 1080, while the sum is 23.

The square root of 51312623 is about 7163.2829764013. The cubic root of 51312623 is about 371.5991727489.

Adding to 51312623 its reverse (32621315), we get a palindrome (83933938).

The spelling of 51312623 in words is "fifty-one million, three hundred twelve thousand, six hundred twenty-three".