2154785289 has 16 divisors (see below), whose sum is σ = 3020848320. Its totient is φ = 1364247360.

The previous prime is 2154785287. The next prime is 2154785329. The reversal of 2154785289 is 9825874512.

It is not a de Polignac number, because 2154785289 - 2¹ = 2154785287 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2154785287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197707 + ... + 208320.

It is an arithmetic number, because the mean of its divisors is an integer number (188803020).

Almost surely, 2^2154785289 is an apocalyptic number.

2154785289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2154785289 is a deficient number, since it is larger than the sum of its proper divisors (866063031).

2154785289 is a wasteful number, since it uses less digits than its factorization.

2154785289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406120.

The product of its digits is 1612800, while the sum is 51.

The square root of 2154785289 is about 46419.6648953867. The cubic root of 2154785289 is about 1291.6197207347.

The spelling of 2154785289 in words is "two billion, one hundred fifty-four million, seven hundred eighty-five thousand, two hundred eighty-nine".