Search a number
-
+
100000081 is a prime number
BaseRepresentation
bin1011111010111…
…10000101010001
320222011112022201
411331132011101
5201100000311
613531203201
72322662266
oct575360521
9228145281
10100000081
11514a15a5
12295a6501
131794385c
14d3d126d
158ba49c1
hex5f5e151

100000081 has 2 divisors, whose sum is σ = 100000082. Its totient is φ = 100000080.

The previous prime is 100000073. The next prime is 100000123. The reversal of 100000081 is 180000001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 81 = 10000^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000081 - 23 = 100000073 is a prime.

It is a super-2 number, since 2×1000000812 = 20000032400013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100001081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000040 + 50000041.

It is an arithmetic number, because the mean of its divisors is an integer number (50000041).

Almost surely, 2100000081 is an apocalyptic number.

It is an amenable number.

100000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000081 is an equidigital number, since it uses as much as digits as its factorization.

100000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 100000081 is about 10000.0040499992. The cubic root of 100000081 is about 464.1590086841.

Adding to 100000081 its reverse (180000001), we get a palindrome (280000082).

It can be divided in two parts, 1000000 and 81, that multiplied together give a square (81000000 = 90002).

The spelling of 100000081 in words is "one hundred million, eighty-one", and thus it is an aban number.