51075517 has 4 divisors (see below), whose sum is σ = 52039260. Its totient is φ = 50111776.

The previous prime is 51075509. The next prime is 51075523. The reversal of 51075517 is 71557015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36168196 + 14907321 = 6014^2 + 3861^2 .

It is a cyclic number.

It is not a de Polignac number, because 51075517 - 2³ = 51075509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51075527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481792 + ... + 481897.

It is an arithmetic number, because the mean of its divisors is an integer number (13009815).

Almost surely, 2^51075517 is an apocalyptic number.

It is an amenable number.

51075517 is a deficient number, since it is larger than the sum of its proper divisors (963743).

51075517 is an equidigital number, since it uses as much as digits as its factorization.

51075517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963742.

The product of its (nonzero) digits is 6125, while the sum is 31.

The square root of 51075517 is about 7146.7137203053. The cubic root of 51075517 is about 371.0259255403.

The spelling of 51075517 in words is "fifty-one million, seventy-five thousand, five hundred seventeen".