51729789 has 4 divisors (see below), whose sum is σ = 68973056. Its totient is φ = 34486524.

The previous prime is 51729787. The next prime is 51729791. The reversal of 51729789 is 98792715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51729787) and next prime (51729791).

It is not a de Polignac number, because 51729789 - 2¹ = 51729787 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 (51729787) 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, 8621629 + ... + 8621634.

It is an arithmetic number, because the mean of its divisors is an integer number (17243264).

Almost surely, 2^51729789 is an apocalyptic number.

It is an amenable number.

51729789 is a deficient number, since it is larger than the sum of its proper divisors (17243267).

51729789 is a wasteful number, since it uses less digits than its factorization.

51729789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17243266.

The product of its digits is 317520, while the sum is 48.

The square root of 51729789 is about 7192.3423861771. The cubic root of 51729789 is about 372.6034762001.

The spelling of 51729789 in words is "fifty-one million, seven hundred twenty-nine thousand, seven hundred eighty-nine".