181974029 has 8 divisors (see below), whose sum is σ = 187979160. Its totient is φ = 176026176.

The previous prime is 181974017. The next prime is 181974047. The reversal of 181974029 is 920479181.

It can be written as a sum of positive squares in 4 ways, for example, as 89775625 + 92198404 = 9475^2 + 9602^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181974029 - 2¹² = 181969933 is a prime.

It is a super-2 number, since 2×181974029² = 66229094460985682, 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 (181974049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7814 + ... + 20615.

It is an arithmetic number, because the mean of its divisors is an integer number (23497395).

Almost surely, 2^181974029 is an apocalyptic number.

It is an amenable number.

181974029 is a deficient number, since it is larger than the sum of its proper divisors (6005131).

181974029 is a wasteful number, since it uses less digits than its factorization.

181974029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28639.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 181974029 is about 13489.7749795910. The cubic root of 181974029 is about 566.6781536695.

The spelling of 181974029 in words is "one hundred eighty-one million, nine hundred seventy-four thousand, twenty-nine".