491957061 has 8 divisors (see below), whose sum is σ = 657548160. Its totient is φ = 327168672.

The previous prime is 491957057. The next prime is 491957087. The reversal of 491957061 is 160759194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491957061 - 2² = 491957057 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491957461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199245 + ... + 201698.

It is an arithmetic number, because the mean of its divisors is an integer number (82193520).

Almost surely, 2^491957061 is an apocalyptic number.

It is an amenable number.

491957061 is a deficient number, since it is larger than the sum of its proper divisors (165591099).

491957061 is a wasteful number, since it uses less digits than its factorization.

491957061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401355.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 491957061 is about 22180.1050718882. The cubic root of 491957061 is about 789.4217105277.

The spelling of 491957061 in words is "four hundred ninety-one million, nine hundred fifty-seven thousand, sixty-one".