2949871857123 has 4 divisors (see below), whose sum is σ = 3933162476168. Its totient is φ = 1966581238080.

The previous prime is 2949871857113. The next prime is 2949871857169. The reversal of 2949871857123 is 3217581789492.

2949871857123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2949871857123 - 2¹⁴ = 2949871840739 is a prime.

It is a super-3 number, since 3×2949871857123³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2949871857113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491645309518 + ... + 491645309523.

It is an arithmetic number, because the mean of its divisors is an integer number (983290619042).

Almost surely, 2^{2949871857123} is an apocalyptic number.

2949871857123 is a deficient number, since it is larger than the sum of its proper divisors (983290619045).

2949871857123 is an equidigital number, since it uses as much as digits as its factorization.

2949871857123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983290619044.

The product of its digits is 60963840, while the sum is 66.

The spelling of 2949871857123 in words is "two trillion, nine hundred forty-nine billion, eight hundred seventy-one million, eight hundred fifty-seven thousand, one hundred twenty-three".