51139471 has 8 divisors (see below), whose sum is σ = 51761664. Its totient is φ = 50520960.

The previous prime is 51139447. The next prime is 51139481. The reversal of 51139471 is 17493115.

51139471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51139471 - 2⁷ = 51139343 is a prime.

It is a super-3 number, since 3×51139471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51139481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34971 + ... + 36403.

It is an arithmetic number, because the mean of its divisors is an integer number (6470208).

Almost surely, 2^51139471 is an apocalyptic number.

51139471 is a deficient number, since it is larger than the sum of its proper divisors (622193).

51139471 is a wasteful number, since it uses less digits than its factorization.

51139471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841.

The product of its digits is 3780, while the sum is 31.

The square root of 51139471 is about 7151.1866847398. The cubic root of 51139471 is about 371.1807204821.

The spelling of 51139471 in words is "fifty-one million, one hundred thirty-nine thousand, four hundred seventy-one".