2491118547 has 4 divisors (see below), whose sum is σ = 3321491400. Its totient is φ = 1660745696.

The previous prime is 2491118543. The next prime is 2491118593. The reversal of 2491118547 is 7458111942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2491118547 - 2² = 2491118543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2491118499 and 2491118508.

It is not an unprimeable number, because it can be changed into a prime (2491118543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415186422 + ... + 415186427.

It is an arithmetic number, because the mean of its divisors is an integer number (830372850).

Almost surely, 2^2491118547 is an apocalyptic number.

2491118547 is a deficient number, since it is larger than the sum of its proper divisors (830372853).

2491118547 is an equidigital number, since it uses as much as digits as its factorization.

2491118547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830372852.

The product of its digits is 80640, while the sum is 42.

The square root of 2491118547 is about 49911.1064493666. The cubic root of 2491118547 is about 1355.5997031326.

The spelling of 2491118547 in words is "two billion, four hundred ninety-one million, one hundred eighteen thousand, five hundred forty-seven".