1002221191 has 2 divisors, whose sum is σ = 1002221192. Its totient is φ = 1002221190.

The previous prime is 1002221189. The next prime is 1002221219. The reversal of 1002221191 is 1911222001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1002221191 - 2¹ = 1002221189 is a prime.

Together with 1002221189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002221491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501110595 + 501110596.

It is an arithmetic number, because the mean of its divisors is an integer number (501110596).

Almost surely, 2^1002221191 is an apocalyptic number.

1002221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002221191 is an equidigital number, since it uses as much as digits as its factorization.

1002221191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1002221191 is about 31657.8772345841. The cubic root of 1002221191 is about 1000.7398494877.

Adding to 1002221191 its reverse (1911222001), we get a palindrome (2913443192).

It can be divided in two parts, 10022 and 21191, that added together give a palindrome (31213).

The spelling of 1002221191 in words is "one billion, two million, two hundred twenty-one thousand, one hundred ninety-one".