51284729369 has 4 divisors (see below), whose sum is σ = 51424470144. Its totient is φ = 51144988596.

The previous prime is 51284729351. The next prime is 51284729371. The reversal of 51284729369 is 96392748215.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51284729369 is a prime.

It is a super-2 number, since 2×51284729369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51284729329) 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, 69869837 + ... + 69870570.

It is an arithmetic number, because the mean of its divisors is an integer number (12856117536).

Almost surely, 2^51284729369 is an apocalyptic number.

It is an amenable number.

51284729369 is a deficient number, since it is larger than the sum of its proper divisors (139740775).

51284729369 is a wasteful number, since it uses less digits than its factorization.

51284729369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139740774.

The product of its digits is 6531840, while the sum is 56.

The spelling of 51284729369 in words is "fifty-one billion, two hundred eighty-four million, seven hundred twenty-nine thousand, three hundred sixty-nine".