51143515 has 4 divisors (see below), whose sum is σ = 61372224. Its totient is φ = 40914808.

The previous prime is 51143503. The next prime is 51143551. The reversal of 51143515 is 51534115.

It is a happy number.

51143515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51143515 - 2⁷ = 51143387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51143515.

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 3 ways as a sum of consecutive naturals, for example, 5114347 + ... + 5114356.

It is an arithmetic number, because the mean of its divisors is an integer number (15343056).

Almost surely, 2^51143515 is an apocalyptic number.

51143515 is a deficient number, since it is larger than the sum of its proper divisors (10228709).

51143515 is a wasteful number, since it uses less digits than its factorization.

51143515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10228708.

The product of its digits is 1500, while the sum is 25.

The square root of 51143515 is about 7151.4694294250. The cubic root of 51143515 is about 371.1905042834.

The spelling of 51143515 in words is "fifty-one million, one hundred forty-three thousand, five hundred fifteen".