491397 has 16 divisors (see below), whose sum is σ = 711360. Its totient is φ = 300672.

The previous prime is 491377. The next prime is 491417. The reversal of 491397 is 793194.

It is an interprime number because it is at equal distance from previous prime (491377) and next prime (491417).

It is not a de Polignac number, because 491397 - 2⁶ = 491333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491327) 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 15 ways as a sum of consecutive naturals, for example, 1993 + ... + 2225.

It is an arithmetic number, because the mean of its divisors is an integer number (44460).

2⁴⁹¹³⁹⁷ is an apocalyptic number.

It is an amenable number.

491397 is a deficient number, since it is larger than the sum of its proper divisors (219963).

491397 is a wasteful number, since it uses less digits than its factorization.

491397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 6804, while the sum is 33.

The square root of 491397 is about 700.9971469271. The cubic root of 491397 is about 78.9122028414.

It can be divided in two parts, 491 and 397, that added together give a palindrome (888).

The spelling of 491397 in words is "four hundred ninety-one thousand, three hundred ninety-seven".