5221781 has 2 divisors, whose sum is σ = 5221782. Its totient is φ = 5221780.

The previous prime is 5221757. The next prime is 5221787. The reversal of 5221781 is 1871225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5134756 + 87025 = 2266^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 5221781 - 2⁶ = 5221717 is a prime.

It is a super-2 number, since 2×5221781² = 54533993623922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5221781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5221787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610890 + 2610891.

It is an arithmetic number, because the mean of its divisors is an integer number (2610891).

Almost surely, 2^5221781 is an apocalyptic number.

It is an amenable number.

5221781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5221781 is an equidigital number, since it uses as much as digits as its factorization.

5221781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

The square root of 5221781 is about 2285.1216597809. The cubic root of 5221781 is about 173.4893758357.

The spelling of 5221781 in words is "five million, two hundred twenty-one thousand, seven hundred eighty-one".