1813081 has 2 divisors, whose sum is σ = 1813082. Its totient is φ = 1813080.

The previous prime is 1813073. The next prime is 1813121. The reversal of 1813081 is 1803181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1731856 + 81225 = 1316^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813081 - 2³ = 1813073 is a prime.

It is a super-2 number, since 2×1813081² = 6574525425122, which contains 22 as substring.

It is a Chen prime.

1813081 is a lucky 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, 906540 + 906541.

It is an arithmetic number, because the mean of its divisors is an integer number (906541).

2^1813081 is an apocalyptic number.

It is an amenable number.

1813081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813081 is an equidigital number, since it uses as much as digits as its factorization.

1813081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1813081 is about 1346.5069624774. The cubic root of 1813081 is about 121.9380003886.

The spelling of 1813081 in words is "one million, eight hundred thirteen thousand, eighty-one".