181085669 has 2 divisors, whose sum is σ = 181085670. Its totient is φ = 181085668.

The previous prime is 181085587. The next prime is 181085677. The reversal of 181085669 is 966580181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105308644 + 75777025 = 10262^2 + 8705^2 .

It is a cyclic number.

It is not a de Polignac number, because 181085669 - 2⁸ = 181085413 is a prime.

It is a super-2 number, since 2×181085669² = 65584039034355122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181085369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90542834 + 90542835.

It is an arithmetic number, because the mean of its divisors is an integer number (90542835).

Almost surely, 2^181085669 is an apocalyptic number.

It is an amenable number.

181085669 is a deficient number, since it is larger than the sum of its proper divisors (1).

181085669 is an equidigital number, since it uses as much as digits as its factorization.

181085669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 181085669 is about 13456.8075337355. The cubic root of 181085669 is about 565.7545134029.

The spelling of 181085669 in words is "one hundred eighty-one million, eighty-five thousand, six hundred sixty-nine".