491522 has 8 divisors (see below), whose sum is σ = 751356.
Its totient is φ = 241072.
The previous prime is 491503. The next prime is 491527. The reversal of 491522 is 225194.
It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 121 = 701^2 + 11^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is an Ulam number.
It is not an unprimeable number, because it can be changed into a prime (491527) by changing a digit.
491522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213 + ... + 2424.
2491522 is an apocalyptic number.
491522 is a deficient number, since it is larger than the sum of its proper divisors (259834).
491522 is a wasteful number, since it uses less digits than its factorization.
491522 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4692.
The product of its digits is 720, while the sum is 23.
The square root of 491522 is about 701.0862999660.
The cubic root of 491522 is about 78.9188934189.
The spelling of 491522 in words is "four hundred ninety-one thousand, five hundred twenty-two".