181730641 has 4 divisors (see below), whose sum is σ = 181790784. Its totient is φ = 181670500.

The previous prime is 181730621. The next prime is 181730657. The reversal of 181730641 is 146037181.

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: 146037181 = 2389 ⋅61129.

It is a cyclic number.

It is not a de Polignac number, because 181730641 - 2⁵ = 181730609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181730621) 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, 25285 + ... + 31666.

It is an arithmetic number, because the mean of its divisors is an integer number (45447696).

Almost surely, 2^181730641 is an apocalyptic number.

It is an amenable number.

181730641 is a deficient number, since it is larger than the sum of its proper divisors (60143).

181730641 is an equidigital number, since it uses as much as digits as its factorization.

181730641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60142.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 181730641 is about 13480.7507580253. The cubic root of 181730641 is about 566.4253992904.

The spelling of 181730641 in words is "one hundred eighty-one million, seven hundred thirty thousand, six hundred forty-one".