51578939 has 8 divisors (see below), whose sum is σ = 54949440. Its totient is φ = 48274056.

The previous prime is 51578929. The next prime is 51578959. The reversal of 51578939 is 93987515.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51578939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51578893 and 51578902.

It is not an unprimeable number, because it can be changed into a prime (51578929) 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, 14777 + ... + 17930.

It is an arithmetic number, because the mean of its divisors is an integer number (6868680).

Almost surely, 2^51578939 is an apocalyptic number.

51578939 is a deficient number, since it is larger than the sum of its proper divisors (3370501).

51578939 is a wasteful number, since it uses less digits than its factorization.

51578939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32809.

The product of its digits is 340200, while the sum is 47.

The square root of 51578939 is about 7181.8478819869. The cubic root of 51578939 is about 372.2409387419.

The spelling of 51578939 in words is "fifty-one million, five hundred seventy-eight thousand, nine hundred thirty-nine".