51451515 has 48 divisors (see below), whose sum is σ = 92776320. Its totient is φ = 26357760.

The previous prime is 51451513. The next prime is 51451541. The reversal of 51451515 is 51515415.

51451515 is a `hidden beast` number, since 5 + 145 + 1 + 515 = 666.

51451515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51451515 - 2¹ = 51451513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51451513) 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 47 ways as a sum of consecutive naturals, for example, 145579 + ... + 145931.

It is an arithmetic number, because the mean of its divisors is an integer number (1932840).

Almost surely, 2^51451515 is an apocalyptic number.

51451515 is a deficient number, since it is larger than the sum of its proper divisors (41324805).

51451515 is a wasteful number, since it uses less digits than its factorization.

51451515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 481 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 51451515 is about 7172.9711417236. The cubic root of 51451515 is about 371.9341498079.

The spelling of 51451515 in words is "fifty-one million, four hundred fifty-one thousand, five hundred fifteen".