891988106 has 8 divisors (see below), whose sum is σ = 1346843424. Its totient is φ = 443040300.

The previous prime is 891988073. The next prime is 891988133. The reversal of 891988106 is 601889198.

It is a happy number.

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

It is a Curzon 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 in 3 ways as a sum of consecutive naturals, for example, 1476500 + ... + 1477103.

It is an arithmetic number, because the mean of its divisors is an integer number (168355428).

Almost surely, 2^891988106 is an apocalyptic number.

891988106 is a deficient number, since it is larger than the sum of its proper divisors (454855318).

891988106 is a wasteful number, since it uses less digits than its factorization.

891988106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953756.

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 891988106 is about 29866.1699251846. The cubic root of 891988106 is about 962.6158784643.

The spelling of 891988106 in words is "eight hundred ninety-one million, nine hundred eighty-eight thousand, one hundred six".