51139617 has 8 divisors (see below), whose sum is σ = 68529600. Its totient is φ = 33921360.

The previous prime is 51139609. The next prime is 51139637. The reversal of 51139617 is 71693115.

It is a happy number.

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

It is not a de Polignac number, because 51139617 - 2³ = 51139609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51139637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42234 + ... + 43427.

It is an arithmetic number, because the mean of its divisors is an integer number (8566200).

Almost surely, 2^51139617 is an apocalyptic number.

It is an amenable number.

51139617 is a deficient number, since it is larger than the sum of its proper divisors (17389983).

51139617 is a wasteful number, since it uses less digits than its factorization.

51139617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85863.

The product of its digits is 5670, while the sum is 33.

The square root of 51139617 is about 7151.1968928285. The cubic root of 51139617 is about 371.1810737144.

The spelling of 51139617 in words is "fifty-one million, one hundred thirty-nine thousand, six hundred seventeen".