2491181217 has 32 divisors (see below), whose sum is σ = 4303968000. Its totient is φ = 1423526832.

The previous prime is 2491181201. The next prime is 2491181227. The reversal of 2491181217 is 7121811942.

It is not a de Polignac number, because 2491181217 - 2⁴ = 2491181201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2491181227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125238 + ... + 143759.

It is an arithmetic number, because the mean of its divisors is an integer number (134499000).

Almost surely, 2^2491181217 is an apocalyptic number.

2491181217 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2491181217 is a deficient number, since it is larger than the sum of its proper divisors (1812786783).

2491181217 is an equidigital number, since it uses as much as digits as its factorization.

2491181217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269027 (or 269007 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 2491181217 is about 49911.7342615942. The cubic root of 2491181217 is about 1355.6110708133.

The spelling of 2491181217 in words is "two billion, four hundred ninety-one million, one hundred eighty-one thousand, two hundred seventeen".