13555261 has 2 divisors, whose sum is σ = 13555262. Its totient is φ = 13555260.

The previous prime is 13555259. The next prime is 13555279. The reversal of 13555261 is 16255531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 2232036 = 3365^2 + 1494^2 .

It is a cyclic number.

It is not a de Polignac number, because 13555261 - 2¹ = 13555259 is a prime.

Together with 13555259, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13555231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6777630 + 6777631.

It is an arithmetic number, because the mean of its divisors is an integer number (6777631).

Almost surely, 2^13555261 is an apocalyptic number.

It is an amenable number.

13555261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13555261 is an equidigital number, since it uses as much as digits as its factorization.

13555261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 28.

The square root of 13555261 is about 3681.7470038013. The cubic root of 13555261 is about 238.4346094541.

The spelling of 13555261 in words is "thirteen million, five hundred fifty-five thousand, two hundred sixty-one".