491509546 has 16 divisors (see below), whose sum is σ = 811410048. Its totient is φ = 221435200.

The previous prime is 491509523. The next prime is 491509547. The reversal of 491509546 is 645905194.

It is a super-2 number, since 2×491509546² = 483163267618252232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491509547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96370 + ... + 101341.

It is an arithmetic number, because the mean of its divisors is an integer number (50713128).

Almost surely, 2^491509546 is an apocalyptic number.

491509546 is a deficient number, since it is larger than the sum of its proper divisors (319900502).

491509546 is a wasteful number, since it uses less digits than its factorization.

491509546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197837.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 491509546 is about 22170.0145692329. The cubic root of 491509546 is about 789.1822687415.

The spelling of 491509546 in words is "four hundred ninety-one million, five hundred nine thousand, five hundred forty-six".