51516442 has 8 divisors (see below), whose sum is σ = 77527296. Its totient is φ = 25674012.

The previous prime is 51516433. The next prime is 51516449. The reversal of 51516442 is 24461515.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51516442.

It is not an unprimeable number, because it can be changed into a prime (51516449) 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, 41338 + ... + 42565.

It is an arithmetic number, because the mean of its divisors is an integer number (9690912).

Almost surely, 2^51516442 is an apocalyptic number.

51516442 is a deficient number, since it is larger than the sum of its proper divisors (26010854).

51516442 is a wasteful number, since it uses less digits than its factorization.

51516442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84212.

The product of its digits is 4800, while the sum is 28.

The square root of 51516442 is about 7177.4955242062. The cubic root of 51516442 is about 372.0905327502.

Adding to 51516442 its reverse (24461515), we get a palindrome (75977957).

The spelling of 51516442 in words is "fifty-one million, five hundred sixteen thousand, four hundred forty-two".