Search a number
181132801 = 421742953
BaseRepresentation
bin10101100101111…
…01111000000001
3110121211111111021
422302331320001
5332332222201
625550145441
74326413653
oct1262757001
9417744437
10181132801
1193276833
12507b2281
132b6ac695
141a0b06d3
1510d7dea1
hexacbde01

181132801 has 4 divisors (see below), whose sum is σ = 181179972. Its totient is φ = 181085632.

The previous prime is 181132759. The next prime is 181132837. The reversal of 181132801 is 108231181.

Adding to 181132801 its reverse (108231181), we get a palindrome (289363982).

181132801 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: 108231181 = 257421133.

It can be written as a sum of positive squares in 2 ways, for example, as 81432576 + 99700225 = 9024^2 + 9985^2 .

It is a cyclic number.

It is not a de Polignac number, because 181132801 - 217 = 181001729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181132901) 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, 17260 + ... + 25693.

It is an arithmetic number, because the mean of its divisors is an integer number (45294993).

It is a 3840-hyperperfect number.

Almost surely, 2181132801 is an apocalyptic number.

It is an amenable number.

181132801 is a deficient number, since it is larger than the sum of its proper divisors (47171).

181132801 is an equidigital number, since it uses as much as digits as its factorization.

181132801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47170.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 181132801 is about 13458.5586523966. The cubic root of 181132801 is about 565.8035929882.

The spelling of 181132801 in words is "one hundred eighty-one million, one hundred thirty-two thousand, eight hundred one".

Divisors: 1 4217 42953 181132801