4222781 has 2 divisors, whose sum is σ = 4222782. Its totient is φ = 4222780.

The previous prime is 4222763. The next prime is 4222793. The reversal of 4222781 is 1872224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2992900 + 1229881 = 1730^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 4222781 - 2⁶ = 4222717 is a prime.

It is a super-2 number, since 2×4222781² = 35663758747922, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 4222781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4222711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2111390 + 2111391.

It is an arithmetic number, because the mean of its divisors is an integer number (2111391).

Almost surely, 2^4222781 is an apocalyptic number.

It is an amenable number.

4222781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4222781 is an equidigital number, since it uses as much as digits as its factorization.

4222781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 26.

The square root of 4222781 is about 2054.9406317458. The cubic root of 4222781 is about 161.6340492291.

The spelling of 4222781 in words is "four million, two hundred twenty-two thousand, seven hundred eighty-one".