2155289 has 4 divisors (see below), whose sum is σ = 2205456. Its totient is φ = 2105124.

The previous prime is 2155273. The next prime is 2155291. The reversal of 2155289 is 9825512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155289 - 2⁴ = 2155273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25019 + ... + 25104.

It is an arithmetic number, because the mean of its divisors is an integer number (551364).

2^2155289 is an apocalyptic number.

It is an amenable number.

2155289 is a deficient number, since it is larger than the sum of its proper divisors (50167).

2155289 is an equidigital number, since it uses as much as digits as its factorization.

2155289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50166.

The product of its digits is 7200, while the sum is 32.

The square root of 2155289 is about 1468.0902560810. The cubic root of 2155289 is about 129.1720357579.

The spelling of 2155289 in words is "two million, one hundred fifty-five thousand, two hundred eighty-nine".