13611971 has 2 divisors, whose sum is σ = 13611972. Its totient is φ = 13611970.

The previous prime is 13611953. The next prime is 13611977. The reversal of 13611971 is 17911631.

13611971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (17911631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13611971 - 2¹⁸ = 13349827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13611977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6805985 + 6805986.

It is an arithmetic number, because the mean of its divisors is an integer number (6805986).

Almost surely, 2^13611971 is an apocalyptic number.

13611971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13611971 is an equidigital number, since it uses as much as digits as its factorization.

13611971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 29.

The square root of 13611971 is about 3689.4404724836. The cubic root of 13611971 is about 238.7666530785.

The spelling of 13611971 in words is "thirteen million, six hundred eleven thousand, nine hundred seventy-one".