491901 has 8 divisors (see below), whose sum is σ = 684480. Its totient is φ = 313632.

The previous prime is 491899. The next prime is 491923. The reversal of 491901 is 109194.

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

It is not a de Polignac number, because 491901 - 2¹ = 491899 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3496 + ... + 3633.

It is an arithmetic number, because the mean of its divisors is an integer number (85560).

2⁴⁹¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

491901 is a deficient number, since it is larger than the sum of its proper divisors (192579).

491901 is a wasteful number, since it uses less digits than its factorization.

491901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 491901 is about 701.3565427085. The cubic root of 491901 is about 78.9391723187.

The spelling of 491901 in words is "four hundred ninety-one thousand, nine hundred one".