13555631 has 2 divisors, whose sum is σ = 13555632. Its totient is φ = 13555630.

The previous prime is 13555601. The next prime is 13555639. The reversal of 13555631 is 13655531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13555631 is a prime.

It is a super-2 number, since 2×13555631² = 367510263616322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13555594 and 13555603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13555639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6777815 + 6777816.

It is an arithmetic number, because the mean of its divisors is an integer number (6777816).

Almost surely, 2^13555631 is an apocalyptic number.

13555631 is a deficient number, since it is larger than the sum of its proper divisors (1).

13555631 is an equidigital number, since it uses as much as digits as its factorization.

13555631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 29.

The square root of 13555631 is about 3681.7972513434. The cubic root of 13555631 is about 238.4367788455.

The spelling of 13555631 in words is "thirteen million, five hundred fifty-five thousand, six hundred thirty-one".