1008779221 has 2 divisors, whose sum is σ = 1008779222. Its totient is φ = 1008779220.

The previous prime is 1008779209. The next prime is 1008779323. The reversal of 1008779221 is 1229778001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965034225 + 43744996 = 31065^2 + 6614^2 .

It is an emirp because it is prime and its reverse (1229778001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1008779221 - 2¹¹ = 1008777173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1008771221) 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, 504389610 + 504389611.

It is an arithmetic number, because the mean of its divisors is an integer number (504389611).

Almost surely, 2^1008779221 is an apocalyptic number.

It is an amenable number.

1008779221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1008779221 is an equidigital number, since it uses as much as digits as its factorization.

1008779221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 1008779221 is about 31761.2849393723. The cubic root of 1008779221 is about 1002.9178846681.

The spelling of 1008779221 in words is "one billion, eight million, seven hundred seventy-nine thousand, two hundred twenty-one".