5101781 has 2 divisors, whose sum is σ = 5101782. Its totient is φ = 5101780.

The previous prime is 5101771. The next prime is 5101783. The reversal of 5101781 is 1871015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4972900 + 128881 = 2230^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 5101781 - 2¹⁰ = 5100757 is a prime.

It is a super-2 number, since 2×5101781² = 52056338743922, which contains 22 as substring.

Together with 5101783, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5101783) 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, 2550890 + 2550891.

It is an arithmetic number, because the mean of its divisors is an integer number (2550891).

Almost surely, 2^5101781 is an apocalyptic number.

It is an amenable number.

5101781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5101781 is an equidigital number, since it uses as much as digits as its factorization.

5101781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 23.

The square root of 5101781 is about 2258.7122437354. The cubic root of 5101781 is about 172.1500965799.

Adding to 5101781 its reverse (1871015), we get a palindrome (6972796).

The spelling of 5101781 in words is "five million, one hundred one thousand, seven hundred eighty-one".