2155872349 has 2 divisors, whose sum is σ = 2155872350. Its totient is φ = 2155872348.

The previous prime is 2155872337. The next prime is 2155872359. The reversal of 2155872349 is 9432785512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2155744900 + 127449 = 46430^2 + 357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155872349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155872299 and 2155872308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155872319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077936174 + 1077936175.

It is an arithmetic number, because the mean of its divisors is an integer number (1077936175).

Almost surely, 2^2155872349 is an apocalyptic number.

It is an amenable number.

2155872349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155872349 is an equidigital number, since it uses as much as digits as its factorization.

2155872349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The square root of 2155872349 is about 46431.3724651770. The cubic root of 2155872349 is about 1291.8368857729.

The spelling of 2155872349 in words is "two billion, one hundred fifty-five million, eight hundred seventy-two thousand, three hundred forty-nine".