51250013 has 2 divisors, whose sum is σ = 51250014. Its totient is φ = 51250012.

The previous prime is 51250007. The next prime is 51250057. The reversal of 51250013 is 31005215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49182169 + 2067844 = 7013^2 + 1438^2 .

It is a cyclic number.

It is not a de Polignac number, because 51250013 - 2⁴ = 51249997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51249973 and 51250000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51250613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25625006 + 25625007.

It is an arithmetic number, because the mean of its divisors is an integer number (25625007).

Almost surely, 2^51250013 is an apocalyptic number.

It is an amenable number.

51250013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51250013 is an equidigital number, since it uses as much as digits as its factorization.

51250013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51250013 is about 7158.9114395975. The cubic root of 51250013 is about 371.4479734793.

Adding to 51250013 its reverse (31005215), we get a palindrome (82255228).

The spelling of 51250013 in words is "fifty-one million, two hundred fifty thousand, thirteen".