181396123 has 4 divisors (see below), whose sum is σ = 181428280. Its totient is φ = 181363968.

The previous prime is 181396109. The next prime is 181396129. The reversal of 181396123 is 321693181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321693181 = 101 ⋅3185081.

It is a cyclic number.

It is not a de Polignac number, because 181396123 - 2¹³ = 181387931 is a prime.

It is a super-2 number, since 2×181396123² = 65809106878862258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181396129) 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 3 ways as a sum of consecutive naturals, for example, 5133 + ... + 19726.

It is an arithmetic number, because the mean of its divisors is an integer number (45357070).

Almost surely, 2^181396123 is an apocalyptic number.

181396123 is a deficient number, since it is larger than the sum of its proper divisors (32157).

181396123 is an equidigital number, since it uses as much as digits as its factorization.

181396123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32156.

The product of its digits is 7776, while the sum is 34.

The square root of 181396123 is about 13468.3377964766. The cubic root of 181396123 is about 566.0776394222.

The spelling of 181396123 in words is "one hundred eighty-one million, three hundred ninety-six thousand, one hundred twenty-three".