38651609 has 2 divisors, whose sum is σ = 38651610. Its totient is φ = 38651608.

The previous prime is 38651581. The next prime is 38651611. The reversal of 38651609 is 90615683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26296384 + 12355225 = 5128^2 + 3515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38651609 is a prime.

Together with 38651611, 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 (38651209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19325804 + 19325805.

It is an arithmetic number, because the mean of its divisors is an integer number (19325805).

Almost surely, 2^38651609 is an apocalyptic number.

It is an amenable number.

38651609 is a deficient number, since it is larger than the sum of its proper divisors (1).

38651609 is an equidigital number, since it uses as much as digits as its factorization.

38651609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 38651609 is about 6217.0418206732. The cubic root of 38651609 is about 338.1083210818.

The spelling of 38651609 in words is "thirty-eight million, six hundred fifty-one thousand, six hundred nine".