51365515 has 8 divisors (see below), whose sum is σ = 62053200. Its totient is φ = 40816032.

The previous prime is 51365513. The next prime is 51365539. The reversal of 51365515 is 51556315.

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 51365515 - 2¹ = 51365513 is a prime.

It is a super-2 number, since 2×51365515² = 5276832262430450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51365513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33729 + ... + 35218.

It is an arithmetic number, because the mean of its divisors is an integer number (7756650).

Almost surely, 2^51365515 is an apocalyptic number.

51365515 is a deficient number, since it is larger than the sum of its proper divisors (10687685).

51365515 is a wasteful number, since it uses less digits than its factorization.

51365515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69101.

The product of its digits is 11250, while the sum is 31.

The square root of 51365515 is about 7166.9739081428. The cubic root of 51365515 is about 371.7268078412.

The spelling of 51365515 in words is "fifty-one million, three hundred sixty-five thousand, five hundred fifteen".