1011563221 has 2 divisors, whose sum is σ = 1011563222. Its totient is φ = 1011563220.

The previous prime is 1011563219. The next prime is 1011563243. The reversal of 1011563221 is 1223651101.

It is a happy number.

It is an a-pointer prime, because the next prime (1011563243) can be obtained adding 1011563221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 735006321 + 276556900 = 27111^2 + 16630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011563221 - 2¹ = 1011563219 is a prime.

Together with 1011563219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1011563192 and 1011563201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011566221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505781610 + 505781611.

It is an arithmetic number, because the mean of its divisors is an integer number (505781611).

Almost surely, 2^1011563221 is an apocalyptic number.

It is an amenable number.

1011563221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011563221 is an equidigital number, since it uses as much as digits as its factorization.

1011563221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1011563221 is about 31805.0816851647. The cubic root of 1011563221 is about 1003.8396452552.

The spelling of 1011563221 in words is "one billion, eleven million, five hundred sixty-three thousand, two hundred twenty-one".