1000222261 has 2 divisors, whose sum is σ = 1000222262. Its totient is φ = 1000222260.

The previous prime is 1000222243. The next prime is 1000222273. The reversal of 1000222261 is 1622220001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870604036 + 129618225 = 29506^2 + 11385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000222261 - 2⁷ = 1000222133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000222211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500111130 + 500111131.

It is an arithmetic number, because the mean of its divisors is an integer number (500111131).

Almost surely, 2^1000222261 is an apocalyptic number.

It is an amenable number.

1000222261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000222261 is an equidigital number, since it uses as much as digits as its factorization.

1000222261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1000222261 is about 31626.2906614102. The cubic root of 1000222261 is about 1000.0740815118.

Adding to 1000222261 its reverse (1622220001), we get a palindrome (2622442262).

The spelling of 1000222261 in words is "one billion, two hundred twenty-two thousand, two hundred sixty-one".