181133641 has 4 divisors (see below), whose sum is σ = 195067012. Its totient is φ = 167200272.

The previous prime is 181133627. The next prime is 181133647. The reversal of 181133641 is 146331181.

181133641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146331181 = 467 ⋅313343.

It can be written as a sum of positive squares in 2 ways, for example, as 120231225 + 60902416 = 10965^2 + 7804^2 .

It is a cyclic number.

It is not a de Polignac number, because 181133641 - 2⁵ = 181133609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181133647) 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, 6966666 + ... + 6966691.

It is an arithmetic number, because the mean of its divisors is an integer number (48766753).

Almost surely, 2^181133641 is an apocalyptic number.

It is an amenable number.

181133641 is a deficient number, since it is larger than the sum of its proper divisors (13933371).

181133641 is a wasteful number, since it uses less digits than its factorization.

181133641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13933370.

The product of its digits is 1728, while the sum is 28.

The square root of 181133641 is about 13458.5898592683. The cubic root of 181133641 is about 565.8044676214.

The spelling of 181133641 in words is "one hundred eighty-one million, one hundred thirty-three thousand, six hundred forty-one".