491051 has 4 divisors (see below), whose sum is σ = 535704. Its totient is φ = 446400.

The previous prime is 491041. The next prime is 491059. The reversal of 491051 is 150194.

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

It is a cyclic number.

It is not a de Polignac number, because 491051 - 2¹⁴ = 474667 is a prime.

It is a super-2 number, since 2×491051² = 482262169202, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491051.

It is not an unprimeable number, because it can be changed into a prime (491059) 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 3 ways as a sum of consecutive naturals, for example, 22310 + ... + 22331.

It is an arithmetic number, because the mean of its divisors is an integer number (133926).

2⁴⁹¹⁰⁵¹ is an apocalyptic number.

491051 is a deficient number, since it is larger than the sum of its proper divisors (44653).

491051 is a wasteful number, since it uses less digits than its factorization.

491051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44652.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 491051 is about 700.7503121655. The cubic root of 491051 is about 78.8936774041.

The spelling of 491051 in words is "four hundred ninety-one thousand, fifty-one".