991141 has 8 divisors (see below), whose sum is σ = 1023840. Its totient is φ = 959088.

The previous prime is 991129. The next prime is 991147. The reversal of 991141 is 141199.

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

It is a cyclic number.

It is not a de Polignac number, because 991141 - 2¹⁹ = 466853 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 (991147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6235 + ... + 6391.

It is an arithmetic number, because the mean of its divisors is an integer number (127980).

2⁹⁹¹¹⁴¹ is an apocalyptic number.

It is an amenable number.

991141 is a deficient number, since it is larger than the sum of its proper divisors (32699).

991141 is a wasteful number, since it uses less digits than its factorization.

991141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323.

The product of its digits is 324, while the sum is 25.

The square root of 991141 is about 995.5606460683. The cubic root of 991141 is about 99.7038236618.

It can be divided in two parts, 9911 and 41, that multiplied together give a triangular number (406351 = T₉₀₁).

The spelling of 991141 in words is "nine hundred ninety-one thousand, one hundred forty-one".