5201681 has 2 divisors, whose sum is σ = 5201682. Its totient is φ = 5201680.

The previous prime is 5201671. The next prime is 5201683. The reversal of 5201681 is 1861025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 707281 = 2120^2 + 841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5201681 is a prime.

It is a super-2 number, since 2×5201681² = 54114970451522, which contains 22 as substring.

Together with 5201683, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is equal to p₃₆₁₅₁₇ and since 5201681 and 361517 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (5201683) 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, 2600840 + 2600841.

It is an arithmetic number, because the mean of its divisors is an integer number (2600841).

Almost surely, 2^5201681 is an apocalyptic number.

It is an amenable number.

5201681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5201681 is an equidigital number, since it uses as much as digits as its factorization.

5201681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 5201681 is about 2280.7194040478. The cubic root of 5201681 is about 173.2664876202.

The spelling of 5201681 in words is "five million, two hundred one thousand, six hundred eighty-one".