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1802081 is a prime number
BaseRepresentation
bin110110111111101100001
310101112222202
412313331201
5430131311
6102342545
721213611
oct6677541
93345882
101802081
111020a26
1272aa55
134b1328
1434ca41
15258e3b
hex1b7f61

1802081 has 2 divisors, whose sum is σ = 1802082. Its totient is φ = 1802080.

The previous prime is 1802077. The next prime is 1802083.

1802081 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1731856 + 70225 = 1316^2 + 265^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1802081 - 22 = 1802077 is a prime.

It is a super-2 number, since 2×18020812 = 6494991861122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1802083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1802083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 901040 + 901041.

It is an arithmetic number, because the mean of its divisors is an integer number (901041).

21802081 is an apocalyptic number.

It is an amenable number.

1802081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1802081 is an equidigital number, since it uses as much as digits as its factorization.

1802081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1802081 is about 1342.4161053861. The cubic root of 1802081 is about 121.6908998664.

The spelling of 1802081 in words is "one million, eight hundred two thousand, eighty-one".