481991 has 4 divisors (see below), whose sum is σ = 485112. Its totient is φ = 478872.

The previous prime is 481963. The next prime is 481997. The reversal of 481991 is 199184.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 481991 - 2¹⁰ = 480967 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 (481997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1316 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (121278).

2⁴⁸¹⁹⁹¹ is an apocalyptic number.

481991 is a deficient number, since it is larger than the sum of its proper divisors (3121).

481991 is a wasteful number, since it uses less digits than its factorization.

481991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120.

The product of its digits is 2592, while the sum is 32.

The square root of 481991 is about 694.2557165771. The cubic root of 481991 is about 78.4054604520.

The spelling of 481991 in words is "four hundred eighty-one thousand, nine hundred ninety-one".