441991 has 8 divisors (see below), whose sum is σ = 503424. Its totient is φ = 384120.

The previous prime is 441971. The next prime is 442003. The reversal of 441991 is 199144.

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

It is not a de Polignac number, because 441991 - 2⁹ = 441479 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (441971) 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, 621 + ... + 1126.

It is an arithmetic number, because the mean of its divisors is an integer number (62928).

2⁴⁴¹⁹⁹¹ is an apocalyptic number.

441991 is a deficient number, since it is larger than the sum of its proper divisors (61433).

441991 is a wasteful number, since it uses less digits than its factorization.

441991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

The product of its digits is 1296, while the sum is 28.

The square root of 441991 is about 664.8240368699. The cubic root of 441991 is about 76.1735990085.

The spelling of 441991 in words is "four hundred forty-one thousand, nine hundred ninety-one".