2489851871 has 4 divisors (see below), whose sum is σ = 2681378952. Its totient is φ = 2298324792.

The previous prime is 2489851783. The next prime is 2489851879. The reversal of 2489851871 is 1781589842.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2489851871 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 (2489851879) 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, 95763521 + ... + 95763546.

It is an arithmetic number, because the mean of its divisors is an integer number (670344738).

Almost surely, 2^2489851871 is an apocalyptic number.

2489851871 is a deficient number, since it is larger than the sum of its proper divisors (191527081).

2489851871 is a wasteful number, since it uses less digits than its factorization.

2489851871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191527080.

The product of its digits is 1290240, while the sum is 53.

The square root of 2489851871 is about 49898.4155159260. The cubic root of 2489851871 is about 1355.3699005097.

The spelling of 2489851871 in words is "two billion, four hundred eighty-nine million, eight hundred fifty-one thousand, eight hundred seventy-one".