491165140 has 12 divisors (see below), whose sum is σ = 1031446836. Its totient is φ = 196466048.

The previous prime is 491165137. The next prime is 491165153. The reversal of 491165140 is 41561194.

It can be written as a sum of positive squares in 2 ways, for example, as 345142084 + 146023056 = 18578^2 + 12084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12279109 + ... + 12279148.

It is an arithmetic number, because the mean of its divisors is an integer number (85953903).

Almost surely, 2^491165140 is an apocalyptic number.

It is an amenable number.

491165140 is an abundant number, since it is smaller than the sum of its proper divisors (540281696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491165140 is a wasteful number, since it uses less digits than its factorization.

491165140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24558266 (or 24558264 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 491165140 is about 22162.2458248256. The cubic root of 491165140 is about 788.9978961832.

The spelling of 491165140 in words is "four hundred ninety-one million, one hundred sixty-five thousand, one hundred forty".