51565515 has 8 divisors (see below), whose sum is σ = 82504848. Its totient is φ = 27501600.

The previous prime is 51565511. The next prime is 51565519. The reversal of 51565515 is 51556515.

It is an interprime number because it is at equal distance from previous prime (51565511) and next prime (51565519).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51565515 - 2² = 51565511 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51565511) 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, 1718836 + ... + 1718865.

It is an arithmetic number, because the mean of its divisors is an integer number (10313106).

Almost surely, 2^51565515 is an apocalyptic number.

51565515 is a deficient number, since it is larger than the sum of its proper divisors (30939333).

51565515 is a wasteful number, since it uses less digits than its factorization.

51565515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3437709.

The product of its digits is 18750, while the sum is 33.

The square root of 51565515 is about 7180.9132427568. The cubic root of 51565515 is about 372.2086426405.

The spelling of 51565515 in words is "fifty-one million, five hundred sixty-five thousand, five hundred fifteen".