991368441 has 24 divisors (see below), whose sum is σ = 1669948800. Its totient is φ = 566494488.

The previous prime is 991368431. The next prime is 991368457. The reversal of 991368441 is 144863199.

It is not a de Polignac number, because 991368441 - 2¹⁰ = 991367417 is a prime.

It is a super-2 number, since 2×991368441² = 1965622771621540962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991368431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157485 + ... + 163658.

It is an arithmetic number, because the mean of its divisors is an integer number (69581200).

Almost surely, 2^991368441 is an apocalyptic number.

It is an amenable number.

991368441 is a deficient number, since it is larger than the sum of its proper divisors (678580359).

991368441 is a wasteful number, since it uses less digits than its factorization.

991368441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321170 (or 321153 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 991368441 is about 31486.0038906178. The cubic root of 991368441 is about 997.1144955390.

The spelling of 991368441 in words is "nine hundred ninety-one million, three hundred sixty-eight thousand, four hundred forty-one".