51545513 has 4 divisors (see below), whose sum is σ = 54577620. Its totient is φ = 48513408.

The previous prime is 51545497. The next prime is 51545531. The reversal of 51545513 is 31554515.

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 47513449 + 4032064 = 6893^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 51545513 - 2⁴ = 51545497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51545563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516028 + ... + 1516061.

It is an arithmetic number, because the mean of its divisors is an integer number (13644405).

Almost surely, 2^51545513 is an apocalyptic number.

It is an amenable number.

51545513 is a deficient number, since it is larger than the sum of its proper divisors (3032107).

51545513 is a wasteful number, since it uses less digits than its factorization.

51545513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032106.

The product of its digits is 7500, while the sum is 29.

The square root of 51545513 is about 7179.5203878811. The cubic root of 51545513 is about 372.1605104725.

The spelling of 51545513 in words is "fifty-one million, five hundred forty-five thousand, five hundred thirteen".