1206181 has 2 divisors, whose sum is σ = 1206182. Its totient is φ = 1206180.

The previous prime is 1206173. The next prime is 1206187. The reversal of 1206181 is 1816021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1083681 + 122500 = 1041^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206181 - 2³ = 1206173 is a prime.

It is a super-2 number, since 2×1206181² = 2909745209522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603090 + 603091.

It is an arithmetic number, because the mean of its divisors is an integer number (603091).

2^1206181 is an apocalyptic number.

It is an amenable number.

1206181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206181 is an equidigital number, since it uses as much as digits as its factorization.

1206181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1206181 is about 1098.2627190249. The cubic root of 1206181 is about 106.4479971234.

The spelling of 1206181 in words is "one million, two hundred six thousand, one hundred eighty-one".