873145181 has 4 divisors (see below), whose sum is σ = 873580092. Its totient is φ = 872710272.

The previous prime is 873145157. The next prime is 873145243. The reversal of 873145181 is 181541378.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 419881081 + 453264100 = 20491^2 + 21290^2 .

It is a cyclic number.

It is not a de Polignac number, because 873145181 - 2¹⁴ = 873128797 is a prime.

It is a super-2 number, since 2×873145181² = 1524765014207045522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (873145781) 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, 214430 + ... + 218463.

It is an arithmetic number, because the mean of its divisors is an integer number (218395023).

Almost surely, 2^873145181 is an apocalyptic number.

It is an amenable number.

873145181 is a deficient number, since it is larger than the sum of its proper divisors (434911).

873145181 is a wasteful number, since it uses less digits than its factorization.

873145181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434910.

The product of its digits is 26880, while the sum is 38.

The square root of 873145181 is about 29549.0301194472. The cubic root of 873145181 is about 955.7892768779.

The spelling of 873145181 in words is "eight hundred seventy-three million, one hundred forty-five thousand, one hundred eighty-one".