51065513 has 4 divisors (see below), whose sum is σ = 52445700. Its totient is φ = 49685328.

The previous prime is 51065489. The next prime is 51065527. The reversal of 51065513 is 31556015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31556015 = 5 ⋅6311203.

It can be written as a sum of positive squares in 2 ways, for example, as 22250089 + 28815424 = 4717^2 + 5368^2 .

It is a cyclic number.

It is not a de Polignac number, because 51065513 - 2⁶ = 51065449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51065533) 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, 690038 + ... + 690111.

It is an arithmetic number, because the mean of its divisors is an integer number (13111425).

Almost surely, 2^51065513 is an apocalyptic number.

It is an amenable number.

51065513 is a deficient number, since it is larger than the sum of its proper divisors (1380187).

51065513 is a wasteful number, since it uses less digits than its factorization.

51065513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380186.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 51065513 is about 7146.0137839218. The cubic root of 51065513 is about 371.0017000670.

The spelling of 51065513 in words is "fifty-one million, sixty-five thousand, five hundred thirteen".