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1810001 is a prime number
BaseRepresentation
bin110111001111001010001
310101221212002
412321321101
5430410001
6102443345
721245654
oct6717121
93357762
101810001
111026976
12733555
134b4b0b
1435189b
1525b46b
hex1b9e51

1810001 has 2 divisors, whose sum is σ = 1810002. Its totient is φ = 1810000.

The previous prime is 1809991. The next prime is 1810013. The reversal of 1810001 is 1000181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1560001 + 250000 = 1249^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1810001 - 26 = 1809937 is a prime.

It is a super-2 number, since 2×18100012 = 6552207240002, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1813001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905000 + 905001.

It is an arithmetic number, because the mean of its divisors is an integer number (905001).

21810001 is an apocalyptic number.

It is an amenable number.

1810001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1810001 is an equidigital number, since it uses as much as digits as its factorization.

1810001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1810001 is about 1345.3627763544. The cubic root of 1810001 is about 121.8689132178.

Adding to 1810001 its reverse (1000181), we get a palindrome (2810182).

The spelling of 1810001 in words is "one million, eight hundred ten thousand, one".