2155295881 has 4 divisors (see below), whose sum is σ = 2155389700. Its totient is φ = 2155202064.

The previous prime is 2155295869. The next prime is 2155295897. The reversal of 2155295881 is 1885925512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 955366281 + 1199929600 = 30909^2 + 34640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155295881 is a prime.

It is a super-2 number, since 2×2155295881² = 9290600669311132322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155295081) 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 3 ways as a sum of consecutive naturals, for example, 13375 + ... + 67003.

It is an arithmetic number, because the mean of its divisors is an integer number (538847425).

Almost surely, 2^2155295881 is an apocalyptic number.

It is an amenable number.

2155295881 is a deficient number, since it is larger than the sum of its proper divisors (93819).

2155295881 is an equidigital number, since it uses as much as digits as its factorization.

2155295881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93818.

The product of its digits is 288000, while the sum is 46.

The square root of 2155295881 is about 46425.1643077329. The cubic root of 2155295881 is about 1291.7217322308.

The spelling of 2155295881 in words is "two billion, one hundred fifty-five million, two hundred ninety-five thousand, eight hundred eighty-one".