51145613 has 2 divisors, whose sum is σ = 51145614. Its totient is φ = 51145612.

The previous prime is 51145609. The next prime is 51145637. The reversal of 51145613 is 31654115.

51145613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38663524 + 12482089 = 6218^2 + 3533^2 .

It is a cyclic number.

It is not a de Polignac number, because 51145613 - 2² = 51145609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51145603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25572806 + 25572807.

It is an arithmetic number, because the mean of its divisors is an integer number (25572807).

Almost surely, 2^51145613 is an apocalyptic number.

It is an amenable number.

51145613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51145613 is an equidigital number, since it uses as much as digits as its factorization.

51145613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 51145613 is about 7151.6161110619. The cubic root of 51145613 is about 371.1955798505.

Adding to 51145613 its reverse (31654115), we get a palindrome (82799728).

The spelling of 51145613 in words is "fifty-one million, one hundred forty-five thousand, six hundred thirteen".