206173381 has 2 divisors, whose sum is σ = 206173382. Its totient is φ = 206173380.

The previous prime is 206173337. The next prime is 206173417. The reversal of 206173381 is 183371602.

206173381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184036356 + 22137025 = 13566^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 206173381 - 2¹³ = 206165189 is a prime.

It is a super-2 number, since 2×206173381² = 85014926065942322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206173481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103086690 + 103086691.

It is an arithmetic number, because the mean of its divisors is an integer number (103086691).

Almost surely, 2^206173381 is an apocalyptic number.

It is an amenable number.

206173381 is a deficient number, since it is larger than the sum of its proper divisors (1).

206173381 is an equidigital number, since it uses as much as digits as its factorization.

206173381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 206173381 is about 14358.7388373770. The cubic root of 206173381 is about 590.7597041132.

The spelling of 206173381 in words is "two hundred six million, one hundred seventy-three thousand, three hundred eighty-one".