1889968169 has 2 divisors, whose sum is σ = 1889968170. Its totient is φ = 1889968168.

The previous prime is 1889968163. The next prime is 1889968189. The reversal of 1889968169 is 9618699881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876189225 + 13778944 = 43315^2 + 3712^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889968169 - 2¹⁶ = 1889902633 is a prime.

It is a super-2 number, since 2×1889968169² = 7143959359666425122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1889968163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944984084 + 944984085.

It is an arithmetic number, because the mean of its divisors is an integer number (944984085).

Almost surely, 2^1889968169 is an apocalyptic number.

It is an amenable number.

1889968169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889968169 is an equidigital number, since it uses as much as digits as its factorization.

1889968169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 65.

The square root of 1889968169 is about 43473.7641457466. The cubic root of 1889968169 is about 1236.3786489178.

The spelling of 1889968169 in words is "one billion, eight hundred eighty-nine million, nine hundred sixty-eight thousand, one hundred sixty-nine".