209183081 has 2 divisors, whose sum is σ = 209183082. Its totient is φ = 209183080.

The previous prime is 209183069. The next prime is 209183087. The reversal of 209183081 is 180381902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114918400 + 94264681 = 10720^2 + 9709^2 .

It is a cyclic number.

It is not a de Polignac number, because 209183081 - 2⁶ = 209183017 is a prime.

It is a super-2 number, since 2×209183081² = 87515122753305122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (209183087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104591540 + 104591541.

It is an arithmetic number, because the mean of its divisors is an integer number (104591541).

Almost surely, 2^209183081 is an apocalyptic number.

It is an amenable number.

209183081 is a deficient number, since it is larger than the sum of its proper divisors (1).

209183081 is an equidigital number, since it uses as much as digits as its factorization.

209183081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 209183081 is about 14463.1628975131. The cubic root of 209183081 is about 593.6204472136.

The spelling of 209183081 in words is "two hundred nine million, one hundred eighty-three thousand, eighty-one".