2491136749871 has 8 divisors (see below), whose sum is σ = 3105832831104. Its totient is φ = 1941145519320.

The previous prime is 2491136749867. The next prime is 2491136749877. The reversal of 2491136749871 is 1789476311942.

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

It is not a de Polignac number, because 2491136749871 - 2² = 2491136749867 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 (2491136749877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16176212585 + ... + 16176212738.

It is an arithmetic number, because the mean of its divisors is an integer number (388229103888).

Almost surely, 2^{2491136749871} is an apocalyptic number.

2491136749871 is a deficient number, since it is larger than the sum of its proper divisors (614696081233).

2491136749871 is a wasteful number, since it uses less digits than its factorization.

2491136749871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32352425341.

The product of its digits is 18289152, while the sum is 62.

The spelling of 2491136749871 in words is "two trillion, four hundred ninety-one billion, one hundred thirty-six million, seven hundred forty-nine thousand, eight hundred seventy-one".