990810191 has 8 divisors (see below), whose sum is σ = 1133066880. Its totient is φ = 848731608.

The previous prime is 990810181. The next prime is 990810229. The reversal of 990810191 is 191018099.

It is a happy number.

990810191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 990810191 - 2²² = 986615887 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 (990810151) 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, 32381 + ... + 55046.

It is an arithmetic number, because the mean of its divisors is an integer number (141633360).

Almost surely, 2^990810191 is an apocalyptic number.

990810191 is a deficient number, since it is larger than the sum of its proper divisors (142256689).

990810191 is a wasteful number, since it uses less digits than its factorization.

990810191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89053.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 990810191 is about 31477.1375922272. The cubic root of 990810191 is about 996.9272985092.

The spelling of 990810191 in words is "nine hundred ninety million, eight hundred ten thousand, one hundred ninety-one".