2155123339 has 2 divisors, whose sum is σ = 2155123340. Its totient is φ = 2155123338.

The previous prime is 2155123331. The next prime is 2155123343. The reversal of 2155123339 is 9333215512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2155123339 - 2³ = 2155123331 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155123331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077561669 + 1077561670.

It is an arithmetic number, because the mean of its divisors is an integer number (1077561670).

Almost surely, 2^2155123339 is an apocalyptic number.

2155123339 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155123339 is an equidigital number, since it uses as much as digits as its factorization.

2155123339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 34.

The square root of 2155123339 is about 46423.3059895566. The cubic root of 2155123339 is about 1291.6872617588.

The spelling of 2155123339 in words is "two billion, one hundred fifty-five million, one hundred twenty-three thousand, three hundred thirty-nine".