51516438 has 8 divisors (see below), whose sum is σ = 103032888. Its totient is φ = 17172144.

The previous prime is 51516433. The next prime is 51516449. The reversal of 51516438 is 83461515.

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

51516438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 51516399 and 51516408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516431) 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, 4293031 + ... + 4293042.

It is an arithmetic number, because the mean of its divisors is an integer number (12879111).

Almost surely, 2^51516438 is an apocalyptic number.

51516438 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.

51516438 is a wasteful number, since it uses less digits than its factorization.

51516438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8586078.

The product of its digits is 14400, while the sum is 33.

The square root of 51516438 is about 7177.4952455575. The cubic root of 51516438 is about 372.0905231199.

The spelling of 51516438 in words is "fifty-one million, five hundred sixteen thousand, four hundred thirty-eight".