51615145 has 16 divisors (see below), whose sum is σ = 65765520. Its totient is φ = 38754304.

The previous prime is 51615143. The next prime is 51615149. The reversal of 51615145 is 54151615.

It is a happy number.

51615145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3229209 + 48385936 = 1797^2 + 6956^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615145 - 2¹ = 51615143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51615143) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 42669 + ... + 43861.

It is an arithmetic number, because the mean of its divisors is an integer number (4110345).

Almost surely, 2^51615145 is an apocalyptic number.

It is an amenable number.

51615145 is a deficient number, since it is larger than the sum of its proper divisors (14150375).

51615145 is a wasteful number, since it uses less digits than its factorization.

51615145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724.

The product of its digits is 3000, while the sum is 28.

The square root of 51615145 is about 7184.3681002577. The cubic root of 51615145 is about 372.3280169397.

The spelling of 51615145 in words is "fifty-one million, six hundred fifteen thousand, one hundred forty-five".