491721461 has 8 divisors (see below), whose sum is σ = 613055424. Its totient is φ = 383159520.

The previous prime is 491721457. The next prime is 491721479. The reversal of 491721461 is 164127194.

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

It is a cyclic number.

It is not a de Polignac number, because 491721461 - 2² = 491721457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491721431) 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, 3192920 + ... + 3193073.

It is an arithmetic number, because the mean of its divisors is an integer number (76631928).

Almost surely, 2^491721461 is an apocalyptic number.

It is an amenable number.

491721461 is a deficient number, since it is larger than the sum of its proper divisors (121333963).

491721461 is a wasteful number, since it uses less digits than its factorization.

491721461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6386011.

The product of its digits is 12096, while the sum is 35.

The square root of 491721461 is about 22174.7933699505. The cubic root of 491721461 is about 789.2956714431.

The spelling of 491721461 in words is "four hundred ninety-one million, seven hundred twenty-one thousand, four hundred sixty-one".