491542 has 4 divisors (see below), whose sum is σ = 737316. Its totient is φ = 245770.

The previous prime is 491539. The next prime is 491581. The reversal of 491542 is 245194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245194 = 2 ⋅122597.

It is a super-2 number, since 2×491542² = 483227075528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122884 + ... + 122887.

It is an arithmetic number, because the mean of its divisors is an integer number (184329).

2⁴⁹¹⁵⁴² is an apocalyptic number.

491542 is a deficient number, since it is larger than the sum of its proper divisors (245774).

491542 is a wasteful number, since it uses less digits than its factorization.

491542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245773.

The product of its digits is 1440, while the sum is 25.

The square root of 491542 is about 701.1005634001. The cubic root of 491542 is about 78.9199638060.

The spelling of 491542 in words is "four hundred ninety-one thousand, five hundred forty-two".