491869 has 8 divisors (see below), whose sum is σ = 581760. Its totient is φ = 406896.

The previous prime is 491867. The next prime is 491873. The reversal of 491869 is 968194.

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

It is not a de Polignac number, because 491869 - 2¹ = 491867 is a prime.

It is a super-2 number, since 2×491869² = 483870226322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491867) 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, 1009 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (72720).

2⁴⁹¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

491869 is a deficient number, since it is larger than the sum of its proper divisors (89891).

491869 is a wasteful number, since it uses less digits than its factorization.

491869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459.

The product of its digits is 15552, while the sum is 37.

The square root of 491869 is about 701.3337294042. Note that the first 3 decimals coincide. The cubic root of 491869 is about 78.9374605188.

The spelling of 491869 in words is "four hundred ninety-one thousand, eight hundred sixty-nine".