491540918 has 16 divisors (see below), whose sum is σ = 817974720. Its totient is φ = 219640200.

The previous prime is 491540909. The next prime is 491540939. The reversal of 491540918 is 819045194.

It is a super-2 number, since 2×491540918² = 483224948136565448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188048 + ... + 190643.

It is an arithmetic number, because the mean of its divisors is an integer number (51123420).

Almost surely, 2^491540918 is an apocalyptic number.

491540918 is a deficient number, since it is larger than the sum of its proper divisors (326433802).

491540918 is a wasteful number, since it uses less digits than its factorization.

491540918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378763.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 491540918 is about 22170.7220901801. The cubic root of 491540918 is about 789.1990589881.

The spelling of 491540918 in words is "four hundred ninety-one million, five hundred forty thousand, nine hundred eighteen".