13206181 has 2 divisors, whose sum is σ = 13206182. Its totient is φ = 13206180.

The previous prime is 13206173. The next prime is 13206191. The reversal of 13206181 is 18160231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13205956 + 225 = 3634^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 13206181 - 2³ = 13206173 is a prime.

It is a super-2 number, since 2×13206181² = 348806433209522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13206131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6603090 + 6603091.

It is an arithmetic number, because the mean of its divisors is an integer number (6603091).

Almost surely, 2^13206181 is an apocalyptic number.

It is an amenable number.

13206181 is a deficient number, since it is larger than the sum of its proper divisors (1).

13206181 is an equidigital number, since it uses as much as digits as its factorization.

13206181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 13206181 is about 3634.0309574906. The cubic root of 13206181 is about 236.3700325999.

The spelling of 13206181 in words is "thirteen million, two hundred six thousand, one hundred eighty-one".