2155120889089 has 9 divisors (see below), whose sum is σ = 2506989314817. Its totient is φ = 1847237668164.

The previous prime is 2155120889087. The next prime is 2155120889099. The reversal of 2155120889089 is 9809880215512.

The square root of 2155120889089 is 1468033.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2155120889089 - 2¹ = 2155120889087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155120889087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10171372 + ... + 10381090.

It is an arithmetic number, because the mean of its divisors is an integer number (278554368313).

Almost surely, 2^{2155120889089} is an apocalyptic number.

2155120889089 is the 1468033-rd square number.

2155120889089 is the 734017-th centered octagonal number.

It is an amenable number.

2155120889089 is a deficient number, since it is larger than the sum of its proper divisors (351868425728).

2155120889089 is an frugal number, since it uses more digits than its factorization.

2155120889089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419452 (or 209726 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 58.

The spelling of 2155120889089 in words is "two trillion, one hundred fifty-five billion, one hundred twenty million, eight hundred eighty-nine thousand, eighty-nine".