51043513 has 2 divisors, whose sum is σ = 51043514. Its totient is φ = 51043512.

The previous prime is 51043511. The next prime is 51043561. The reversal of 51043513 is 31534015.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44448889 + 6594624 = 6667^2 + 2568^2 .

It is a cyclic number.

It is not a de Polignac number, because 51043513 - 2¹ = 51043511 is a prime.

Together with 51043511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51043511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25521756 + 25521757.

It is an arithmetic number, because the mean of its divisors is an integer number (25521757).

Almost surely, 2^51043513 is an apocalyptic number.

It is an amenable number.

51043513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51043513 is an equidigital number, since it uses as much as digits as its factorization.

51043513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 51043513 is about 7144.4742983651. The cubic root of 51043513 is about 370.9484142040.

Adding to 51043513 its reverse (31534015), we get a palindrome (82577528).

The spelling of 51043513 in words is "fifty-one million, forty-three thousand, five hundred thirteen".