2155869613 has 2 divisors, whose sum is σ = 2155869614. Its totient is φ = 2155869612.

The previous prime is 2155869607. The next prime is 2155869659. The reversal of 2155869613 is 3169685512.

It is an a-pointer prime, because the next prime (2155869659) can be obtained adding 2155869613 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1795894884 + 359974729 = 42378^2 + 18973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155869613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155863613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077934806 + 1077934807.

It is an arithmetic number, because the mean of its divisors is an integer number (1077934807).

Almost surely, 2^2155869613 is an apocalyptic number.

It is an amenable number.

2155869613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155869613 is an equidigital number, since it uses as much as digits as its factorization.

2155869613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 46.

The square root of 2155869613 is about 46431.3430023298. The cubic root of 2155869613 is about 1291.8363392861.

The spelling of 2155869613 in words is "two billion, one hundred fifty-five million, eight hundred sixty-nine thousand, six hundred thirteen".