1091128898 has 8 divisors (see below), whose sum is σ = 1638007500. Its totient is φ = 545126400.

The previous prime is 1091128891. The next prime is 1091128919. The reversal of 1091128898 is 8988211901.

It can be written as a sum of positive squares in 2 ways, for example, as 1042450369 + 48678529 = 32287^2 + 6977^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1091128891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215903 + ... + 220898.

Almost surely, 2^1091128898 is an apocalyptic number.

1091128898 is a deficient number, since it is larger than the sum of its proper divisors (546878602).

1091128898 is a wasteful number, since it uses less digits than its factorization.

1091128898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438052.

The product of its (nonzero) digits is 82944, while the sum is 47.

The square root of 1091128898 is about 33032.2402812767. The cubic root of 1091128898 is about 1029.4976335492.

The spelling of 1091128898 in words is "one billion, ninety-one million, one hundred twenty-eight thousand, eight hundred ninety-eight".