51339239 has 8 divisors (see below), whose sum is σ = 60259488. Its totient is φ = 42815520.

The previous prime is 51339229. The next prime is 51339259. The reversal of 51339239 is 93293315.

It is a happy number.

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 51339239 - 2¹² = 51335143 is a prime.

It is a super-2 number, since 2×51339239² = 5271434922198242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51339199 and 51339208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51339229) 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, 98852 + ... + 99369.

It is an arithmetic number, because the mean of its divisors is an integer number (7532436).

Almost surely, 2^51339239 is an apocalyptic number.

51339239 is a deficient number, since it is larger than the sum of its proper divisors (8920249).

51339239 is a wasteful number, since it uses less digits than its factorization.

51339239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198265.

The product of its digits is 21870, while the sum is 35.

The square root of 51339239 is about 7165.1405429342. The cubic root of 51339239 is about 371.6634114841.

The spelling of 51339239 in words is "fifty-one million, three hundred thirty-nine thousand, two hundred thirty-nine".