181801065 has 8 divisors (see below), whose sum is σ = 290881728. Its totient is φ = 96960560.

The previous prime is 181801051. The next prime is 181801073. The reversal of 181801065 is 560108181.

It is a happy number.

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

It is not a de Polignac number, because 181801065 - 2⁴ = 181801049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6060021 + ... + 6060050.

It is an arithmetic number, because the mean of its divisors is an integer number (36360216).

Almost surely, 2^181801065 is an apocalyptic number.

181801065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181801065 is a deficient number, since it is larger than the sum of its proper divisors (109080663).

181801065 is a wasteful number, since it uses less digits than its factorization.

181801065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12120079.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 181801065 is about 13483.3625257204. The cubic root of 181801065 is about 566.4985566301.

The spelling of 181801065 in words is "one hundred eighty-one million, eight hundred one thousand, sixty-five".