1813812149 has 2 divisors, whose sum is σ = 1813812150. Its totient is φ = 1813812148.

The previous prime is 1813812101. The next prime is 1813812167. The reversal of 1813812149 is 9412183181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1035681124 + 778131025 = 32182^2 + 27895^2 .

It is an emirp because it is prime and its reverse (9412183181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1813812149 - 2⁸ = 1813811893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813812179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906906074 + 906906075.

It is an arithmetic number, because the mean of its divisors is an integer number (906906075).

Almost surely, 2^1813812149 is an apocalyptic number.

It is an amenable number.

1813812149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813812149 is an equidigital number, since it uses as much as digits as its factorization.

1813812149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 38.

The square root of 1813812149 is about 42588.8735352322. The cubic root of 1813812149 is about 1219.5438922533.

The spelling of 1813812149 in words is "one billion, eight hundred thirteen million, eight hundred twelve thousand, one hundred forty-nine".