51516155 has 8 divisors (see below), whose sum is σ = 61862784. Its totient is φ = 41184000.

The previous prime is 51516097. The next prime is 51516167. The reversal of 51516155 is 55161515.

It is a happy number.

51516155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-51516155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7115 + ... + 12395.

It is an arithmetic number, because the mean of its divisors is an integer number (7732848).

Almost surely, 2^51516155 is an apocalyptic number.

51516155 is a deficient number, since it is larger than the sum of its proper divisors (10346629).

51516155 is a wasteful number, since it uses less digits than its factorization.

51516155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7237.

The product of its digits is 3750, while the sum is 29.

The square root of 51516155 is about 7177.4755311321. The cubic root of 51516155 is about 372.0898417722.

The spelling of 51516155 in words is "fifty-one million, five hundred sixteen thousand, one hundred fifty-five".