181007197 has 4 divisors (see below), whose sum is σ = 206865376. Its totient is φ = 155149020.

The previous prime is 181007161. The next prime is 181007201. The reversal of 181007197 is 791700181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 791700181 = 23 ⋅34421747.

It is a cyclic number.

It is not a de Polignac number, because 181007197 - 2¹⁵ = 180974429 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 (181007107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12929079 + ... + 12929092.

It is an arithmetic number, because the mean of its divisors is an integer number (51716344).

Almost surely, 2^181007197 is an apocalyptic number.

It is an amenable number.

181007197 is a deficient number, since it is larger than the sum of its proper divisors (25858179).

181007197 is an equidigital number, since it uses as much as digits as its factorization.

181007197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25858178.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 181007197 is about 13453.8915188134. The cubic root of 181007197 is about 565.6727798918.

The spelling of 181007197 in words is "one hundred eighty-one million, seven thousand, one hundred ninety-seven".