2489597991 has 24 divisors (see below), whose sum is σ = 3760734960. Its totient is φ = 1627181712.

The previous prime is 2489597989. The next prime is 2489598011. The reversal of 2489597991 is 1997959842.

It is not a de Polignac number, because 2489597991 - 2¹ = 2489597989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2489597951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1886830 + ... + 1888148.

It is an arithmetic number, because the mean of its divisors is an integer number (156697290).

Almost surely, 2^2489597991 is an apocalyptic number.

2489597991 is a deficient number, since it is larger than the sum of its proper divisors (1271136969).

2489597991 is an frugal number, since it uses more digits than its factorization.

2489597991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700 (or 1375 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 63.

The square root of 2489597991 is about 49895.8714825185. The cubic root of 2489597991 is about 1355.3238317709.

The spelling of 2489597991 in words is "two billion, four hundred eighty-nine million, five hundred ninety-seven thousand, nine hundred ninety-one".