2489661921 has 8 divisors (see below), whose sum is σ = 3324714400. Its totient is φ = 1657192032.

The previous prime is 2489661871. The next prime is 2489661953. The reversal of 2489661921 is 1291669842.

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

It is not a de Polignac number, because 2489661921 - 2²² = 2485467617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2489661821) 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, 643396 + ... + 647253.

It is an arithmetic number, because the mean of its divisors is an integer number (415589300).

Almost surely, 2^2489661921 is an apocalyptic number.

It is an amenable number.

2489661921 is a deficient number, since it is larger than the sum of its proper divisors (835052479).

2489661921 is a wasteful number, since it uses less digits than its factorization.

2489661921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291295.

The product of its digits is 373248, while the sum is 48.

The square root of 2489661921 is about 49896.5121125716. The cubic root of 2489661921 is about 1355.3354327217.

The spelling of 2489661921 in words is "two billion, four hundred eighty-nine million, six hundred sixty-one thousand, nine hundred twenty-one".