38155891 has 2 divisors, whose sum is σ = 38155892. Its totient is φ = 38155890.

The previous prime is 38155883. The next prime is 38155913. The reversal of 38155891 is 19855183.

38155891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19855183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38155891 - 2³ = 38155883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38155811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19077945 + 19077946.

It is an arithmetic number, because the mean of its divisors is an integer number (19077946).

Almost surely, 2^38155891 is an apocalyptic number.

38155891 is a deficient number, since it is larger than the sum of its proper divisors (1).

38155891 is an equidigital number, since it uses as much as digits as its factorization.

38155891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 40.

The square root of 38155891 is about 6177.0454911713. The cubic root of 38155891 is about 336.6566517732.

The spelling of 38155891 in words is "thirty-eight million, one hundred fifty-five thousand, eight hundred ninety-one".