2185491491 has 8 divisors (see below), whose sum is σ = 2314650240. Its totient is φ = 2056399488.

The previous prime is 2185491481. The next prime is 2185491523. The reversal of 2185491491 is 1941945812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2185491491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2185491481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61145 + ... + 90053.

It is an arithmetic number, because the mean of its divisors is an integer number (289331280).

Almost surely, 2^2185491491 is an apocalyptic number.

2185491491 is a deficient number, since it is larger than the sum of its proper divisors (129158749).

2185491491 is a wasteful number, since it uses less digits than its factorization.

2185491491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33373.

The product of its digits is 103680, while the sum is 44.

The square root of 2185491491 is about 46749.2405392858. The cubic root of 2185491491 is about 1297.7261020456.

The spelling of 2185491491 in words is "two billion, one hundred eighty-five million, four hundred ninety-one thousand, four hundred ninety-one".