51515147 has 8 divisors (see below), whose sum is σ = 55067040. Its totient is φ = 48072640.

The previous prime is 51515129. The next prime is 51515159. The reversal of 51515147 is 74151515.

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

It is a cyclic number.

It is not a de Polignac number, because 51515147 - 2¹⁰ = 51514123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51515047) 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, 26372 + ... + 28257.

It is an arithmetic number, because the mean of its divisors is an integer number (6883380).

Almost surely, 2^51515147 is an apocalyptic number.

51515147 is a deficient number, since it is larger than the sum of its proper divisors (3551893).

51515147 is a wasteful number, since it uses less digits than its factorization.

51515147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54693.

The product of its digits is 3500, while the sum is 29.

The square root of 51515147 is about 7177.4053111135. The cubic root of 51515147 is about 372.0874149024.

The spelling of 51515147 in words is "fifty-one million, five hundred fifteen thousand, one hundred forty-seven".