1090181 has 2 divisors, whose sum is σ = 1090182. Its totient is φ = 1090180.

The previous prime is 1090169. The next prime is 1090189. The reversal of 1090181 is 1810901.

1090181 is nontrivially palindromic in base 9.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069156 + 21025 = 1034^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1090181 is a prime.

It is a super-2 number, since 2×1090181² = 2376989225522, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1090189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545090 + 545091.

It is an arithmetic number, because the mean of its divisors is an integer number (545091).

2^1090181 is an apocalyptic number.

It is an amenable number.

1090181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090181 is an equidigital number, since it uses as much as digits as its factorization.

1090181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1090181 is about 1044.1173305716. The cubic root of 1090181 is about 102.9199428185.

The spelling of 1090181 in words is "one million, ninety thousand, one hundred eighty-one".