38131609 has 2 divisors, whose sum is σ = 38131610. Its totient is φ = 38131608.

The previous prime is 38131603. The next prime is 38131619. The reversal of 38131609 is 90613183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38093584 + 38025 = 6172^2 + 195^2 .

It is an emirp because it is prime and its reverse (90613183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38131609 - 2⁷ = 38131481 is a prime.

It is not a weakly prime, because it can be changed into another prime (38131603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19065804 + 19065805.

It is an arithmetic number, because the mean of its divisors is an integer number (19065805).

Almost surely, 2^38131609 is an apocalyptic number.

It is an amenable number.

38131609 is a deficient number, since it is larger than the sum of its proper divisors (1).

38131609 is an equidigital number, since it uses as much as digits as its factorization.

38131609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 38131609 is about 6175.0796755993. The cubic root of 38131609 is about 336.5852217239.

The spelling of 38131609 in words is "thirty-eight million, one hundred thirty-one thousand, six hundred nine".