1816901 has 2 divisors, whose sum is σ = 1816902. Its totient is φ = 1816900.

The previous prime is 1816861. The next prime is 1816933. The reversal of 1816901 is 1096181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 139876 = 1295^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816901 - 2¹⁸ = 1554757 is a prime.

It is a super-2 number, since 2×1816901² = 6602258487602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908450 + 908451.

It is an arithmetic number, because the mean of its divisors is an integer number (908451).

2^1816901 is an apocalyptic number.

It is an amenable number.

1816901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816901 is an equidigital number, since it uses as much as digits as its factorization.

1816901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1816901 is about 1347.9247011610. The cubic root of 1816901 is about 122.0235778134.

The spelling of 1816901 in words is "one million, eight hundred sixteen thousand, nine hundred one".