3687813509 has 2 divisors, whose sum is σ = 3687813510. Its totient is φ = 3687813508.

The previous prime is 3687813497. The next prime is 3687813559. The reversal of 3687813509 is 9053187863.

It is a happy number.

It is an a-pointer prime, because the next prime (3687813559) can be obtained adding 3687813509 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3592204225 + 95609284 = 59935^2 + 9778^2 .

It is an emirp because it is prime and its reverse (9053187863) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3687813509 - 2⁸ = 3687813253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3687813559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1843906754 + 1843906755.

It is an arithmetic number, because the mean of its divisors is an integer number (1843906755).

Almost surely, 2^3687813509 is an apocalyptic number.

It is an amenable number.

3687813509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3687813509 is an equidigital number, since it uses as much as digits as its factorization.

3687813509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 3687813509 is about 60727.3703448453. The cubic root of 3687813509 is about 1544.9804334161.

The spelling of 3687813509 in words is "three billion, six hundred eighty-seven million, eight hundred thirteen thousand, five hundred nine".