2191608158 has 4 divisors (see below), whose sum is σ = 3287412240. Its totient is φ = 1095804078.

The previous prime is 2191608149. The next prime is 2191608169. The reversal of 2191608158 is 8518061912.

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

It is a Curzon number.

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, 547902038 + ... + 547902041.

It is an arithmetic number, because the mean of its divisors is an integer number (821853060).

Almost surely, 2^2191608158 is an apocalyptic number.

2191608158 is a deficient number, since it is larger than the sum of its proper divisors (1095804082).

2191608158 is a wasteful number, since it uses less digits than its factorization.

2191608158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095804081.

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 2191608158 is about 46814.6147906826. The cubic root of 2191608158 is about 1298.9356491359.

The spelling of 2191608158 in words is "two billion, one hundred ninety-one million, six hundred eight thousand, one hundred fifty-eight".