491698 has 4 divisors (see below), whose sum is σ = 737550. Its totient is φ = 245848.

The previous prime is 491677. The next prime is 491707. The reversal of 491698 is 896194.

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., 480249 + 11449 = 693^2 + 107^2 .

It is an unprimeable number.

491698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122923 + ... + 122926.

2⁴⁹¹⁶⁹⁸ is an apocalyptic number.

491698 is a deficient number, since it is larger than the sum of its proper divisors (245852).

491698 is a wasteful number, since it uses less digits than its factorization.

491698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245851.

The product of its digits is 15552, while the sum is 37.

The square root of 491698 is about 701.2118082292. The cubic root of 491698 is about 78.9283118293.

Subtracting 491698 from its reverse (896194), we obtain a square (404496 = 636²).

The spelling of 491698 in words is "four hundred ninety-one thousand, six hundred ninety-eight".