1815145361 has 2 divisors, whose sum is σ = 1815145362. Its totient is φ = 1815145360.

The previous prime is 1815145357. The next prime is 1815145363. The reversal of 1815145361 is 1635415181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1523418961 + 291726400 = 39031^2 + 17080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815145361 - 2² = 1815145357 is a prime.

Together with 1815145363, 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 (1815145363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907572680 + 907572681.

It is an arithmetic number, because the mean of its divisors is an integer number (907572681).

Almost surely, 2^1815145361 is an apocalyptic number.

It is an amenable number.

1815145361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815145361 is an equidigital number, since it uses as much as digits as its factorization.

1815145361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 35.

The square root of 1815145361 is about 42604.5227763438. The cubic root of 1815145361 is about 1219.8426207902.

The spelling of 1815145361 in words is "one billion, eight hundred fifteen million, one hundred forty-five thousand, three hundred sixty-one".