181090669 has 2 divisors, whose sum is σ = 181090670. Its totient is φ = 181090668.

The previous prime is 181090649. The next prime is 181090687. The reversal of 181090669 is 966090181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169780900 + 11309769 = 13030^2 + 3363^2 .

It is a cyclic number.

It is not a de Polignac number, because 181090669 - 2¹⁵ = 181057901 is a prime.

It is a super-2 number, since 2×181090669² = 65587660797735122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181090619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90545334 + 90545335.

It is an arithmetic number, because the mean of its divisors is an integer number (90545335).

Almost surely, 2^181090669 is an apocalyptic number.

It is an amenable number.

181090669 is a deficient number, since it is larger than the sum of its proper divisors (1).

181090669 is an equidigital number, since it uses as much as digits as its factorization.

181090669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 181090669 is about 13456.9933120293. The cubic root of 181090669 is about 565.7597204163.

The spelling of 181090669 in words is "one hundred eighty-one million, ninety thousand, six hundred sixty-nine".