1889017129 has 4 divisors (see below), whose sum is σ = 1940071684. Its totient is φ = 1837962576.

The previous prime is 1889017103. The next prime is 1889017139. The reversal of 1889017129 is 9217109881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 820707904 + 1068309225 = 28648^2 + 32685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889017129 - 2¹¹ = 1889015081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1889017139) 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 in 3 ways as a sum of consecutive naturals, for example, 25527222 + ... + 25527295.

It is an arithmetic number, because the mean of its divisors is an integer number (485017921).

Almost surely, 2^1889017129 is an apocalyptic number.

It is an amenable number.

1889017129 is a deficient number, since it is larger than the sum of its proper divisors (51054555).

1889017129 is an equidigital number, since it uses as much as digits as its factorization.

1889017129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51054554.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 1889017129 is about 43462.8246781085. The cubic root of 1889017129 is about 1236.1712304623.

The spelling of 1889017129 in words is "one billion, eight hundred eighty-nine million, seventeen thousand, one hundred twenty-nine".