51345013 has 2 divisors, whose sum is σ = 51345014. Its totient is φ = 51345012.

The previous prime is 51344989. The next prime is 51345017. The reversal of 51345013 is 31054315.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49660209 + 1684804 = 7047^2 + 1298^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51345013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51345017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25672506 + 25672507.

It is an arithmetic number, because the mean of its divisors is an integer number (25672507).

Almost surely, 2^51345013 is an apocalyptic number.

It is an amenable number.

51345013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51345013 is an equidigital number, since it uses as much as digits as its factorization.

51345013 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 51345013 is about 7165.5434546167. The cubic root of 51345013 is about 371.6773443234.

Adding to 51345013 its reverse (31054315), we get a palindrome (82399328).

The spelling of 51345013 in words is "fifty-one million, three hundred forty-five thousand, thirteen".