491642 has 4 divisors (see below), whose sum is σ = 737466. Its totient is φ = 245820.

The previous prime is 491639. The next prime is 491651. The reversal of 491642 is 246194.

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

It can be written as a sum of positive squares in only one way, i.e., 477481 + 14161 = 691^2 + 119^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122909 + ... + 122912.

2⁴⁹¹⁶⁴² is an apocalyptic number.

491642 is a deficient number, since it is larger than the sum of its proper divisors (245824).

491642 is a wasteful number, since it uses less digits than its factorization.

491642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245823.

The product of its digits is 1728, while the sum is 26.

The square root of 491642 is about 701.1718762187. The cubic root of 491642 is about 78.9253153062.

The spelling of 491642 in words is "four hundred ninety-one thousand, six hundred forty-two".