181121181 has 4 divisors (see below), whose sum is σ = 241494912. Its totient is φ = 120747452.

The previous prime is 181121137. The next prime is 181121183.

181121181 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 181121181 - 2¹³ = 181112989 is a prime.

It is a super-2 number, since 2×181121181² = 65609764413669522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181121183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30186861 + ... + 30186866.

It is an arithmetic number, because the mean of its divisors is an integer number (60373728).

Almost surely, 2^181121181 is an apocalyptic number.

It is an amenable number.

181121181 is a deficient number, since it is larger than the sum of its proper divisors (60373731).

181121181 is an equidigital number, since it uses as much as digits as its factorization.

181121181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60373730.

The product of its digits is 128, while the sum is 24.

The square root of 181121181 is about 13458.1269499139. The cubic root of 181121181 is about 565.7914936182.

The spelling of 181121181 in words is "one hundred eighty-one million, one hundred twenty-one thousand, one hundred eighty-one".