1790222221 has 2 divisors, whose sum is σ = 1790222222. Its totient is φ = 1790222220.

The previous prime is 1790222219. The next prime is 1790222251. The reversal of 1790222221 is 1222220971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224020196 + 566202025 = 34986^2 + 23795^2 .

It is an emirp because it is prime and its reverse (1222220971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1790222221 - 2¹ = 1790222219 is a prime.

Together with 1790222219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1790222221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1790222251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895111110 + 895111111.

It is an arithmetic number, because the mean of its divisors is an integer number (895111111).

Almost surely, 2^1790222221 is an apocalyptic number.

It is an amenable number.

1790222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1790222221 is an equidigital number, since it uses as much as digits as its factorization.

1790222221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1790222221 is about 42311.0177258832. The cubic root of 1790222221 is about 1214.2337903670.

The spelling of 1790222221 in words is "one billion, seven hundred ninety million, two hundred twenty-two thousand, two hundred twenty-one".