2155523081 has 2 divisors, whose sum is σ = 2155523082. Its totient is φ = 2155523080.

The previous prime is 2155523063. The next prime is 2155523087. The reversal of 2155523081 is 1803255512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1388233081 + 767290000 = 37259^2 + 27700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155523081 is a prime.

It is a super-3 number, since 3×2155523081³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (2155523087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077761540 + 1077761541.

It is an arithmetic number, because the mean of its divisors is an integer number (1077761541).

Almost surely, 2^2155523081 is an apocalyptic number.

It is an amenable number.

2155523081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155523081 is an equidigital number, since it uses as much as digits as its factorization.

2155523081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 2155523081 is about 46427.6111920482. The cubic root of 2155523081 is about 1291.7671194818.

Adding to 2155523081 its reverse (1803255512), we get a palindrome (3958778593).

The spelling of 2155523081 in words is "two billion, one hundred fifty-five million, five hundred twenty-three thousand, eighty-one".