181149673 has 2 divisors, whose sum is σ = 181149674. Its totient is φ = 181149672.

The previous prime is 181149649. The next prime is 181149677. The reversal of 181149673 is 376941181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180983209 + 166464 = 13453^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 181149673 - 2⁵ = 181149641 is a prime.

It is a super-3 number, since 3×181149673³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (181149677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90574836 + 90574837.

It is an arithmetic number, because the mean of its divisors is an integer number (90574837).

Almost surely, 2^181149673 is an apocalyptic number.

It is an amenable number.

181149673 is a deficient number, since it is larger than the sum of its proper divisors (1).

181149673 is an equidigital number, since it uses as much as digits as its factorization.

181149673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 181149673 is about 13459.1854508362. The cubic root of 181149673 is about 565.8211601025.

The spelling of 181149673 in words is "one hundred eighty-one million, one hundred forty-nine thousand, six hundred seventy-three".