51139851 has 8 divisors (see below), whose sum is σ = 77927424. Its totient is φ = 29222760.

The previous prime is 51139813. The next prime is 51139861. The reversal of 51139851 is 15893115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51139851 - 2¹¹ = 51137803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51139861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217595 + ... + 1217636.

It is an arithmetic number, because the mean of its divisors is an integer number (9740928).

Almost surely, 2^51139851 is an apocalyptic number.

51139851 is a deficient number, since it is larger than the sum of its proper divisors (26787573).

51139851 is a wasteful number, since it uses less digits than its factorization.

51139851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435241.

The product of its digits is 5400, while the sum is 33.

The square root of 51139851 is about 7151.2132537074. The cubic root of 51139851 is about 371.1816398524.

The spelling of 51139851 in words is "fifty-one million, one hundred thirty-nine thousand, eight hundred fifty-one".