51000042 has 8 divisors (see below), whose sum is σ = 102000096. Its totient is φ = 17000012.

The previous prime is 51000041. The next prime is 51000049. The reversal of 51000042 is 24000015.

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

51000042 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 50999991 and 51000027.

It is not an unprimeable number, because it can be changed into a prime (51000041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4249998 + ... + 4250009.

It is an arithmetic number, because the mean of its divisors is an integer number (12750012).

Almost surely, 2^51000042 is an apocalyptic number.

51000042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51000042 is a wasteful number, since it uses less digits than its factorization.

51000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500012.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 51000042 is about 7141.4313691304. The cubic root of 51000042 is about 370.8430787266.

Adding to 51000042 its reverse (24000015), we get a palindrome (75000057).

The spelling of 51000042 in words is "fifty-one million, forty-two", and thus it is an aban number and an uban number.