38521891 has 2 divisors, whose sum is σ = 38521892. Its totient is φ = 38521890.

The previous prime is 38521859. The next prime is 38521907. The reversal of 38521891 is 19812583.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38521891 - 2⁵ = 38521859 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38521891.

It is not a weakly prime, because it can be changed into another prime (38521801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19260945 + 19260946.

It is an arithmetic number, because the mean of its divisors is an integer number (19260946).

Almost surely, 2^38521891 is an apocalyptic number.

38521891 is a deficient number, since it is larger than the sum of its proper divisors (1).

38521891 is an equidigital number, since it uses as much as digits as its factorization.

38521891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 38521891 is about 6206.6005993619. The cubic root of 38521891 is about 337.7296573165.

The spelling of 38521891 in words is "thirty-eight million, five hundred twenty-one thousand, eight hundred ninety-one".