51021713 has 2 divisors, whose sum is σ = 51021714. Its totient is φ = 51021712.

The previous prime is 51021697. The next prime is 51021721. The reversal of 51021713 is 31712015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26091664 + 24930049 = 5108^2 + 4993^2 .

It is a cyclic number.

It is not a de Polignac number, because 51021713 - 2⁴ = 51021697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51021793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510856 + 25510857.

It is an arithmetic number, because the mean of its divisors is an integer number (25510857).

Almost surely, 2^51021713 is an apocalyptic number.

It is an amenable number.

51021713 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021713 is an equidigital number, since it uses as much as digits as its factorization.

51021713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 51021713 is about 7142.9484808446. The cubic root of 51021713 is about 370.8955976528.

Adding to 51021713 its reverse (31712015), we get a palindrome (82733728).

The spelling of 51021713 in words is "fifty-one million, twenty-one thousand, seven hundred thirteen".