491870013 has 8 divisors (see below), whose sum is σ = 655956000. Its totient is φ = 327848688.

The previous prime is 491870003. The next prime is 491870033. The reversal of 491870013 is 310078194.

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

It is not a de Polignac number, because 491870013 - 2¹⁷ = 491738941 is a prime.

It is a super-2 number, since 2×491870013² = 483872219377240338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491870003) 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, 5883 + ... + 31911.

It is an arithmetic number, because the mean of its divisors is an integer number (81994500).

Almost surely, 2^491870013 is an apocalyptic number.

It is an amenable number.

491870013 is a deficient number, since it is larger than the sum of its proper divisors (164085987).

491870013 is a wasteful number, since it uses less digits than its factorization.

491870013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32331.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 491870013 is about 22178.1426859870. The cubic root of 491870013 is about 789.3751470910.

The spelling of 491870013 in words is "four hundred ninety-one million, eight hundred seventy thousand, thirteen".