1028089191 has 8 divisors (see below), whose sum is σ = 1377888880. Its totient is φ = 681841152.

The previous prime is 1028089189. The next prime is 1028089313. The reversal of 1028089191 is 1919808201.

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

It is not a de Polignac number, because 1028089191 - 2¹ = 1028089189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028089591) 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, 887236 + ... + 888393.

It is an arithmetic number, because the mean of its divisors is an integer number (172236110).

Almost surely, 2^1028089191 is an apocalyptic number.

1028089191 is a deficient number, since it is larger than the sum of its proper divisors (349799689).

1028089191 is a wasteful number, since it uses less digits than its factorization.

1028089191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775825.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 1028089191 is about 32063.8299490251. The cubic root of 1028089191 is about 1009.2767396558.

The spelling of 1028089191 in words is "one billion, twenty-eight million, eighty-nine thousand, one hundred ninety-one".