2155505281 has 8 divisors (see below), whose sum is σ = 2173953600. Its totient is φ = 2137117008.

The previous prime is 2155505279. The next prime is 2155505311. The reversal of 2155505281 is 1825055512.

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 2155505281 - 2¹ = 2155505279 is a prime.

It is a super-2 number, since 2×2155505281² = 9292406032837777922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155505251) 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, 58620 + ... + 88018.

It is an arithmetic number, because the mean of its divisors is an integer number (271744200).

Almost surely, 2^2155505281 is an apocalyptic number.

It is an amenable number.

2155505281 is a deficient number, since it is larger than the sum of its proper divisors (18448319).

2155505281 is a wasteful number, since it uses less digits than its factorization.

2155505281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30023.

The product of its (nonzero) digits is 20000, while the sum is 34.

The square root of 2155505281 is about 46427.4194953801. The cubic root of 2155505281 is about 1291.7635637296.

The spelling of 2155505281 in words is "two billion, one hundred fifty-five million, five hundred five thousand, two hundred eighty-one".