9090181 has 2 divisors, whose sum is σ = 9090182. Its totient is φ = 9090180.

The previous prime is 9090173. The next prime is 9090203. The reversal of 9090181 is 1810909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9054081 + 36100 = 3009^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090181 - 2³ = 9090173 is a prime.

It is a super-2 number, since 2×9090181² = 165262781225522, which contains 22 as substring.

It is an Ulam number.

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 (9090131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545090 + 4545091.

It is an arithmetic number, because the mean of its divisors is an integer number (4545091).

Almost surely, 2^9090181 is an apocalyptic number.

It is an amenable number.

9090181 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090181 is an equidigital number, since it uses as much as digits as its factorization.

9090181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 9090181 is about 3014.9927031421. The cubic root of 9090181 is about 208.7008303283.

The spelling of 9090181 in words is "nine million, ninety thousand, one hundred eighty-one".