13555961 has 2 divisors, whose sum is σ = 13555962. Its totient is φ = 13555960.

The previous prime is 13555957. The next prime is 13555967. The reversal of 13555961 is 16955531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8737936 + 4818025 = 2956^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 13555961 - 2² = 13555957 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13555967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6777980 + 6777981.

It is an arithmetic number, because the mean of its divisors is an integer number (6777981).

Almost surely, 2^13555961 is an apocalyptic number.

It is an amenable number.

13555961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13555961 is an equidigital number, since it uses as much as digits as its factorization.

13555961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20250, while the sum is 35.

The square root of 13555961 is about 3681.8420661403. The cubic root of 13555961 is about 238.4387136749.

The spelling of 13555961 in words is "thirteen million, five hundred fifty-five thousand, nine hundred sixty-one".