51507013 has 2 divisors, whose sum is σ = 51507014. Its totient is φ = 51507012.

The previous prime is 51506993. The next prime is 51507017. The reversal of 51507013 is 31070515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49322529 + 2184484 = 7023^2 + 1478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51507013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51507017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25753506 + 25753507.

It is an arithmetic number, because the mean of its divisors is an integer number (25753507).

Almost surely, 2^51507013 is an apocalyptic number.

It is an amenable number.

51507013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51507013 is an equidigital number, since it uses as much as digits as its factorization.

51507013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 525, while the sum is 22.

The square root of 51507013 is about 7176.8386494333. The cubic root of 51507013 is about 372.0678302526.

Adding to 51507013 its reverse (31070515), we get a palindrome (82577528).

The spelling of 51507013 in words is "fifty-one million, five hundred seven thousand, thirteen".