181121023 has 4 divisors (see below), whose sum is σ = 183303288. Its totient is φ = 178938760.

The previous prime is 181120997. The next prime is 181121047. The reversal of 181121023 is 320121181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 181121023 - 2⁵ = 181120991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181121093) 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, 1091008 + ... + 1091173.

It is an arithmetic number, because the mean of its divisors is an integer number (45825822).

Almost surely, 2^181121023 is an apocalyptic number.

181121023 is a deficient number, since it is larger than the sum of its proper divisors (2182265).

181121023 is an equidigital number, since it uses as much as digits as its factorization.

181121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182264.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 181121023 is about 13458.1210798536. The cubic root of 181121023 is about 565.7913290965.

The spelling of 181121023 in words is "one hundred eighty-one million, one hundred twenty-one thousand, twenty-three".