38231621 has 2 divisors, whose sum is σ = 38231622. Its totient is φ = 38231620.

The previous prime is 38231617. The next prime is 38231651. The reversal of 38231621 is 12613283.

38231621 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 can be written as a sum of positive squares in only one way, i.e., 37761025 + 470596 = 6145^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 38231621 - 2² = 38231617 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (38231651) 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, 19115810 + 19115811.

It is an arithmetic number, because the mean of its divisors is an integer number (19115811).

Almost surely, 2^38231621 is an apocalyptic number.

It is an amenable number.

38231621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38231621 is an equidigital number, since it uses as much as digits as its factorization.

38231621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 38231621 is about 6183.1724058124. The cubic root of 38231621 is about 336.8792312933.

The spelling of 38231621 in words is "thirty-eight million, two hundred thirty-one thousand, six hundred twenty-one".