58138921 has 2 divisors, whose sum is σ = 58138922. Its totient is φ = 58138920.

The previous prime is 58138909. The next prime is 58138931. The reversal of 58138921 is 12983185.

58138921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57927321 + 211600 = 7611^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 58138921 - 2¹⁹ = 57614633 is a prime.

It is not a weakly prime, because it can be changed into another prime (58138931) 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, 29069460 + 29069461.

It is an arithmetic number, because the mean of its divisors is an integer number (29069461).

Almost surely, 2^58138921 is an apocalyptic number.

It is an amenable number.

58138921 is a deficient number, since it is larger than the sum of its proper divisors (1).

58138921 is an equidigital number, since it uses as much as digits as its factorization.

58138921 is an odious number, because the sum of its binary digits is odd.

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

The square root of 58138921 is about 7624.8882614764. Note that the first 3 decimals coincide. The cubic root of 58138921 is about 387.3964671028.

The spelling of 58138921 in words is "fifty-eight million, one hundred thirty-eight thousand, nine hundred twenty-one".