1891029889 has 8 divisors (see below), whose sum is σ = 2162464128. Its totient is φ = 1619917440.

The previous prime is 1891029869. The next prime is 1891029923. The reversal of 1891029889 is 9889201981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1891029889 - 2⁷ = 1891029761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1891029869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67717 + ... + 91474.

It is an arithmetic number, because the mean of its divisors is an integer number (270308016).

Almost surely, 2^1891029889 is an apocalyptic number.

It is an amenable number.

1891029889 is a deficient number, since it is larger than the sum of its proper divisors (271434239).

1891029889 is a wasteful number, since it uses less digits than its factorization.

1891029889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160895.

The product of its (nonzero) digits is 746496, while the sum is 55.

The square root of 1891029889 is about 43485.9734742135. The cubic root of 1891029889 is about 1236.6101241051.

The spelling of 1891029889 in words is "one billion, eight hundred ninety-one million, twenty-nine thousand, eight hundred eighty-nine".