491945 has 4 divisors (see below), whose sum is σ = 590340. Its totient is φ = 393552.

The previous prime is 491923. The next prime is 491951. The reversal of 491945 is 549194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65536 + 426409 = 256^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 491945 - 2¹⁰ = 490921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49190 + ... + 49199.

It is an arithmetic number, because the mean of its divisors is an integer number (147585).

2⁴⁹¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

491945 is a deficient number, since it is larger than the sum of its proper divisors (98395).

491945 is an equidigital number, since it uses as much as digits as its factorization.

491945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98394.

The product of its digits is 6480, while the sum is 32.

The square root of 491945 is about 701.3879097903. The cubic root of 491945 is about 78.9415259224.

The spelling of 491945 in words is "four hundred ninety-one thousand, nine hundred forty-five".