181091230 has 16 divisors (see below), whose sum is σ = 326163024. Its totient is φ = 72392320.

The previous prime is 181091227. The next prime is 181091231. The reversal of 181091230 is 32190181.

It is a junction number, because it is equal to n+sod(n) for n = 181091195 and 181091204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181091231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15510 + ... + 24550.

It is an arithmetic number, because the mean of its divisors is an integer number (20385189).

Almost surely, 2^181091230 is an apocalyptic number.

181091230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181091230 is a deficient number, since it is larger than the sum of its proper divisors (145071794).

181091230 is a wasteful number, since it uses less digits than its factorization.

181091230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051.

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

The square root of 181091230 is about 13457.0141561938. The cubic root of 181091230 is about 565.7603046372.

The spelling of 181091230 in words is "one hundred eighty-one million, ninety-one thousand, two hundred thirty".