491145 has 16 divisors (see below), whose sum is σ = 794880. Its totient is φ = 258944.

The previous prime is 491137. The next prime is 491149. The reversal of 491145 is 541194.

It is a cyclic number.

It is not a de Polignac number, because 491145 - 2³ = 491137 is a prime.

It is a super-2 number, since 2×491145² = 482446822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1936 + ... + 2174.

It is an arithmetic number, because the mean of its divisors is an integer number (49680).

2⁴⁹¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

491145 is a deficient number, since it is larger than the sum of its proper divisors (303735).

491145 is a wasteful number, since it uses less digits than its factorization.

491145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its digits is 720, while the sum is 24.

The square root of 491145 is about 700.8173799215. The cubic root of 491145 is about 78.8987111871.

It can be divided in two parts, 491 and 145, that added together give a palindrome (636).

The spelling of 491145 in words is "four hundred ninety-one thousand, one hundred forty-five".