1361815009 has 2 divisors, whose sum is σ = 1361815010. Its totient is φ = 1361815008.

The previous prime is 1361814953. The next prime is 1361815043. The reversal of 1361815009 is 9005181631.

It is an a-pointer prime, because the next prime (1361815043) can be obtained adding 1361815009 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916393984 + 445421025 = 30272^2 + 21105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361815009 - 2¹¹ = 1361812961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361815409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680907504 + 680907505.

It is an arithmetic number, because the mean of its divisors is an integer number (680907505).

Almost surely, 2^1361815009 is an apocalyptic number.

It is an amenable number.

1361815009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361815009 is an equidigital number, since it uses as much as digits as its factorization.

1361815009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1361815009 is about 36902.7777951742. Note that the first 4 decimals coincide. The cubic root of 1361815009 is about 1108.4243013556.

The spelling of 1361815009 in words is "one billion, three hundred sixty-one million, eight hundred fifteen thousand, nine".