2489665871 has 12 divisors (see below), whose sum is σ = 3127515216. Its totient is φ = 1939998720.

The previous prime is 2489665859. The next prime is 2489665903. The reversal of 2489665871 is 1785669842.

It is a happy number.

It is not a de Polignac number, because 2489665871 - 2⁶ = 2489665807 is a prime.

It is a super-2 number, since 2×2489665871² = 12396872298444377282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2489665571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1468850 + ... + 1470543.

It is an arithmetic number, because the mean of its divisors is an integer number (260626268).

Almost surely, 2^2489665871 is an apocalyptic number.

2489665871 is a deficient number, since it is larger than the sum of its proper divisors (637849345).

2489665871 is a wasteful number, since it uses less digits than its factorization.

2489665871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939422 (or 2939411 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The square root of 2489665871 is about 49896.5516944809. The cubic root of 2489665871 is about 1355.3361494953.

The spelling of 2489665871 in words is "two billion, four hundred eighty-nine million, six hundred sixty-five thousand, eight hundred seventy-one".