1815001 has 2 divisors, whose sum is σ = 1815002. Its totient is φ = 1815000.

The previous prime is 1814993. The next prime is 1815007. The reversal of 1815001 is 1005181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1565001 + 250000 = 1251^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815001 - 2³ = 1814993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1815007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907500 + 907501.

It is an arithmetic number, because the mean of its divisors is an integer number (907501).

2^1815001 is an apocalyptic number.

It is an amenable number.

1815001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815001 is an equidigital number, since it uses as much as digits as its factorization.

1815001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1815001 is about 1347.2197296655. The cubic root of 1815001 is about 121.9810281347.

The spelling of 1815001 in words is "one million, eight hundred fifteen thousand, one".