1815836081 has 2 divisors, whose sum is σ = 1815836082. Its totient is φ = 1815836080.

The previous prime is 1815836063. The next prime is 1815836083. The reversal of 1815836081 is 1806385181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984955456 + 830880625 = 31384^2 + 28825^2 .

It is an emirp because it is prime and its reverse (1806385181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1815836081 - 2⁶ = 1815836017 is a prime.

It is a super-2 number, since 2×1815836081² = 6594521346122877122, which contains 22 as substring.

Together with 1815836083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1815836083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907918040 + 907918041.

It is an arithmetic number, because the mean of its divisors is an integer number (907918041).

Almost surely, 2^1815836081 is an apocalyptic number.

It is an amenable number.

1815836081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815836081 is an equidigital number, since it uses as much as digits as its factorization.

1815836081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 1815836081 is about 42612.6281869589. The cubic root of 1815836081 is about 1219.9973306848.

The spelling of 1815836081 in words is "one billion, eight hundred fifteen million, eight hundred thirty-six thousand, eighty-one".