51320515 has 8 divisors (see below), whose sum is σ = 62277120. Its totient is φ = 40594752.

The previous prime is 51320513. The next prime is 51320519. The reversal of 51320515 is 51502315.

51320515 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 cyclic number.

It is not a de Polignac number, because 51320515 - 2¹ = 51320513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51320513) 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 7 ways as a sum of consecutive naturals, for example, 57219 + ... + 58108.

It is an arithmetic number, because the mean of its divisors is an integer number (7784640).

Almost surely, 2^51320515 is an apocalyptic number.

51320515 is a deficient number, since it is larger than the sum of its proper divisors (10956605).

51320515 is a wasteful number, since it uses less digits than its factorization.

51320515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115421.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51320515 is about 7163.8338199598. The cubic root of 51320515 is about 371.6182227095.

The spelling of 51320515 in words is "fifty-one million, three hundred twenty thousand, five hundred fifteen".