1813674409 has 2 divisors, whose sum is σ = 1813674410. Its totient is φ = 1813674408.

The previous prime is 1813674403. The next prime is 1813674419. The reversal of 1813674409 is 9044763181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1434515625 + 379158784 = 37875^2 + 19472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1813674409 is a prime.

It is a super-2 number, since 2×1813674409² = 6578829723722998562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1813674403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906837204 + 906837205.

It is an arithmetic number, because the mean of its divisors is an integer number (906837205).

Almost surely, 2^1813674409 is an apocalyptic number.

It is an amenable number.

1813674409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813674409 is an equidigital number, since it uses as much as digits as its factorization.

1813674409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1813674409 is about 42587.2564155053. The cubic root of 1813674409 is about 1219.5130209513.

The spelling of 1813674409 in words is "one billion, eight hundred thirteen million, six hundred seventy-four thousand, four hundred nine".