38145509 has 2 divisors, whose sum is σ = 38145510. Its totient is φ = 38145508.

The previous prime is 38145479. The next prime is 38145511. The reversal of 38145509 is 90554183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 14884 = 6175^2 + 122^2 .

It is an emirp because it is prime and its reverse (90554183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38145509 is a prime.

Together with 38145511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38145589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19072754 + 19072755.

It is an arithmetic number, because the mean of its divisors is an integer number (19072755).

Almost surely, 2^38145509 is an apocalyptic number.

It is an amenable number.

38145509 is a deficient number, since it is larger than the sum of its proper divisors (1).

38145509 is an equidigital number, since it uses as much as digits as its factorization.

38145509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 38145509 is about 6176.2050646008. The cubic root of 38145509 is about 336.6261148861.

The spelling of 38145509 in words is "thirty-eight million, one hundred forty-five thousand, five hundred nine".