1889970217 has 2 divisors, whose sum is σ = 1889970218. Its totient is φ = 1889970216.

The previous prime is 1889970197. The next prime is 1889970221. The reversal of 1889970217 is 7120799881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1299674601 + 590295616 = 36051^2 + 24296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889970217 - 2¹¹ = 1889968169 is a prime.

It is a super-2 number, since 2×1889970217² = 7143974842294054178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1889970227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944985108 + 944985109.

It is an arithmetic number, because the mean of its divisors is an integer number (944985109).

Almost surely, 2^1889970217 is an apocalyptic number.

It is an amenable number.

1889970217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889970217 is an equidigital number, since it uses as much as digits as its factorization.

1889970217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 52.

The square root of 1889970217 is about 43473.7877001763. The cubic root of 1889970217 is about 1236.3790955042.

The spelling of 1889970217 in words is "one billion, eight hundred eighty-nine million, nine hundred seventy thousand, two hundred seventeen".