1889748109 has 2 divisors, whose sum is σ = 1889748110. Its totient is φ = 1889748108.

The previous prime is 1889748073. The next prime is 1889748121. The reversal of 1889748109 is 9018479881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1720175625 + 169572484 = 41475^2 + 13022^2 .

It is an emirp because it is prime and its reverse (9018479881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1889748109 is a prime.

It is a super-2 number, since 2×1889748109² = 7142295830938151762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1889748109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1889748139) 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, 944874054 + 944874055.

It is an arithmetic number, because the mean of its divisors is an integer number (944874055).

Almost surely, 2^1889748109 is an apocalyptic number.

It is an amenable number.

1889748109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889748109 is an equidigital number, since it uses as much as digits as its factorization.

1889748109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The square root of 1889748109 is about 43471.2331203061. The cubic root of 1889748109 is about 1236.3306607999.

The spelling of 1889748109 in words is "one billion, eight hundred eighty-nine million, seven hundred forty-eight thousand, one hundred nine".