1091208158 has 4 divisors (see below), whose sum is σ = 1636812240. Its totient is φ = 545604078.

The previous prime is 1091208137. The next prime is 1091208187. The reversal of 1091208158 is 8518021901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8518021901 = 239 ⋅35640259.

It is a congruent number.

It is an unprimeable number.

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, 272802038 + ... + 272802041.

It is an arithmetic number, because the mean of its divisors is an integer number (409203060).

Almost surely, 2^1091208158 is an apocalyptic number.

1091208158 is a deficient number, since it is larger than the sum of its proper divisors (545604082).

1091208158 is an equidigital number, since it uses as much as digits as its factorization.

1091208158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545604081.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 1091208158 is about 33033.4399964642. The cubic root of 1091208158 is about 1029.5225606399.

The spelling of 1091208158 in words is "one billion, ninety-one million, two hundred eight thousand, one hundred fifty-eight".