123090181 has 16 divisors (see below), whose sum is σ = 137180160. Its totient is φ = 109992960.

The previous prime is 123090173. The next prime is 123090193. The reversal of 123090181 is 181090321.

It is not a de Polignac number, because 123090181 - 2³ = 123090173 is a prime.

It is a super-2 number, since 2×123090181² = 30302385317225522, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123090281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17701 + ... + 23653.

It is an arithmetic number, because the mean of its divisors is an integer number (8573760).

Almost surely, 2^123090181 is an apocalyptic number.

It is an amenable number.

123090181 is a deficient number, since it is larger than the sum of its proper divisors (14089979).

123090181 is a wasteful number, since it uses less digits than its factorization.

123090181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6036.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 123090181 is about 11094.6014349322. The cubic root of 123090181 is about 497.4404948905.

The spelling of 123090181 in words is "one hundred twenty-three million, ninety thousand, one hundred eighty-one".