181227649 has 4 divisors (see below), whose sum is σ = 189107136. Its totient is φ = 173348164.

The previous prime is 181227647. The next prime is 181227677. The reversal of 181227649 is 946722181.

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: 946722181 = 73 ⋅12968797.

It is a cyclic number.

It is not a de Polignac number, because 181227649 - 2¹ = 181227647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181227647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939709 + ... + 3939754.

It is an arithmetic number, because the mean of its divisors is an integer number (47276784).

Almost surely, 2^181227649 is an apocalyptic number.

It is an amenable number.

181227649 is a deficient number, since it is larger than the sum of its proper divisors (7879487).

181227649 is an equidigital number, since it uses as much as digits as its factorization.

181227649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879486.

The product of its digits is 48384, while the sum is 40.

The square root of 181227649 is about 13462.0818969430. The cubic root of 181227649 is about 565.9023344909.

The spelling of 181227649 in words is "one hundred eighty-one million, two hundred twenty-seven thousand, six hundred forty-nine".