2891720489 has 8 divisors (see below), whose sum is σ = 3305552640. Its totient is φ = 2478070656.

The previous prime is 2891720483. The next prime is 2891720497. The reversal of 2891720489 is 9840271982.

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

It is a cyclic number.

It is not a de Polignac number, because 2891720489 - 2¹² = 2891716393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891720483) 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, 9704 + ... + 76665.

It is an arithmetic number, because the mean of its divisors is an integer number (413194080).

Almost surely, 2^2891720489 is an apocalyptic number.

It is an amenable number.

2891720489 is a deficient number, since it is larger than the sum of its proper divisors (413832151).

2891720489 is an equidigital number, since it uses as much as digits as its factorization.

2891720489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91159.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 2891720489 is about 53774.7197947139. The cubic root of 2891720489 is about 1424.6847340314.

The spelling of 2891720489 in words is "two billion, eight hundred ninety-one million, seven hundred twenty thousand, four hundred eighty-nine".