51702121 has 2 divisors, whose sum is σ = 51702122. Its totient is φ = 51702120.

The previous prime is 51702109. The next prime is 51702149. The reversal of 51702121 is 12120715.

51702121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 12702096 = 6245^2 + 3564^2 .

It is a cyclic number.

It is not a de Polignac number, because 51702121 - 2⁵ = 51702089 is a prime.

It is not a weakly prime, because it can be changed into another prime (51702221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25851060 + 25851061.

It is an arithmetic number, because the mean of its divisors is an integer number (25851061).

Almost surely, 2^51702121 is an apocalyptic number.

It is an amenable number.

51702121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51702121 is an equidigital number, since it uses as much as digits as its factorization.

51702121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 51702121 is about 7190.4186943460. The cubic root of 51702121 is about 372.5370345894.

Adding to 51702121 its reverse (12120715), we get a palindrome (63822836).

The spelling of 51702121 in words is "fifty-one million, seven hundred two thousand, one hundred twenty-one".