1798470221 has 2 divisors, whose sum is σ = 1798470222. Its totient is φ = 1798470220.

The previous prime is 1798470209. The next prime is 1798470229. The reversal of 1798470221 is 1220748971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1439367721 + 359102500 = 37939^2 + 18950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1798470221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1798470229) 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, 899235110 + 899235111.

It is an arithmetic number, because the mean of its divisors is an integer number (899235111).

Almost surely, 2^1798470221 is an apocalyptic number.

It is an amenable number.

1798470221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798470221 is an equidigital number, since it uses as much as digits as its factorization.

1798470221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1798470221 is about 42408.3744206259. The cubic root of 1798470221 is about 1216.0956931145.

The spelling of 1798470221 in words is "one billion, seven hundred ninety-eight million, four hundred seventy thousand, two hundred twenty-one".