181138123 has 8 divisors (see below), whose sum is σ = 186061680. Its totient is φ = 176238720.

The previous prime is 181138109. The next prime is 181138129. The reversal of 181138123 is 321831181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181138123 is a prime.

It is a super-2 number, since 2×181138123² = 65622039207926258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181138091 and 181138100.

It is not an unprimeable number, because it can be changed into a prime (181138129) 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, 9711 + ... + 21367.

It is an arithmetic number, because the mean of its divisors is an integer number (23257710).

Almost surely, 2^181138123 is an apocalyptic number.

181138123 is a deficient number, since it is larger than the sum of its proper divisors (4923557).

181138123 is a wasteful number, since it uses less digits than its factorization.

181138123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12077.

The product of its digits is 1152, while the sum is 28.

The square root of 181138123 is about 13458.7563689964. The cubic root of 181138123 is about 565.8091343686.

The spelling of 181138123 in words is "one hundred eighty-one million, one hundred thirty-eight thousand, one hundred twenty-three".