51516015 has 16 divisors (see below), whose sum is σ = 82620000. Its totient is φ = 27410432.

The previous prime is 51516013. The next prime is 51516019. The reversal of 51516015 is 51061515.

It is a cyclic number.

It is not a de Polignac number, because 51516015 - 2¹ = 51516013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2911 + ... + 10559.

It is an arithmetic number, because the mean of its divisors is an integer number (5163750).

Almost surely, 2^51516015 is an apocalyptic number.

51516015 is a deficient number, since it is larger than the sum of its proper divisors (31103985).

51516015 is a wasteful number, since it uses less digits than its factorization.

51516015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51516015 is about 7177.4657783928. The cubic root of 51516015 is about 372.0895047089.

The spelling of 51516015 in words is "fifty-one million, five hundred sixteen thousand, fifteen".