51013513 has 2 divisors, whose sum is σ = 51013514. Its totient is φ = 51013512.

The previous prime is 51013493. The next prime is 51013519. The reversal of 51013513 is 31531015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33732864 + 17280649 = 5808^2 + 4157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51013513 is a prime.

It is not a weakly prime, because it can be changed into another prime (51013519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506756 + 25506757.

It is an arithmetic number, because the mean of its divisors is an integer number (25506757).

Almost surely, 2^51013513 is an apocalyptic number.

It is an amenable number.

51013513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51013513 is an equidigital number, since it uses as much as digits as its factorization.

51013513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 51013513 is about 7142.3744651201. The cubic root of 51013513 is about 370.8757269830.

Adding to 51013513 its reverse (31531015), we get a palindrome (82544528).

The spelling of 51013513 in words is "fifty-one million, thirteen thousand, five hundred thirteen".