2155786349 has 2 divisors, whose sum is σ = 2155786350. Its totient is φ = 2155786348.

The previous prime is 2155786333. The next prime is 2155786361. The reversal of 2155786349 is 9436875512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2154630724 + 1155625 = 46418^2 + 1075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155786349 - 2⁴ = 2155786333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155786297 and 2155786306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155716349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077893174 + 1077893175.

It is an arithmetic number, because the mean of its divisors is an integer number (1077893175).

Almost surely, 2^2155786349 is an apocalyptic number.

It is an amenable number.

2155786349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155786349 is an equidigital number, since it uses as much as digits as its factorization.

2155786349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 50.

The square root of 2155786349 is about 46430.4463579665. The cubic root of 2155786349 is about 1291.8197079702.

The spelling of 2155786349 in words is "two billion, one hundred fifty-five million, seven hundred eighty-six thousand, three hundred forty-nine".