51207613 has 2 divisors, whose sum is σ = 51207614. Its totient is φ = 51207612.

The previous prime is 51207601. The next prime is 51207617. The reversal of 51207613 is 31670215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45995524 + 5212089 = 6782^2 + 2283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51207613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51207617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25603806 + 25603807.

It is an arithmetic number, because the mean of its divisors is an integer number (25603807).

Almost surely, 2^51207613 is an apocalyptic number.

It is an amenable number.

51207613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51207613 is an equidigital number, since it uses as much as digits as its factorization.

51207613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 51207613 is about 7155.9494827731. The cubic root of 51207613 is about 371.3455101601.

Adding to 51207613 its reverse (31670215), we get a palindrome (82877828).

The spelling of 51207613 in words is "fifty-one million, two hundred seven thousand, six hundred thirteen".