238085521 has 2 divisors, whose sum is σ = 238085522. Its totient is φ = 238085520.

The previous prime is 238085509. The next prime is 238085609. The reversal of 238085521 is 125580832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189365121 + 48720400 = 13761^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 238085521 - 2⁹ = 238085009 is a prime.

It is not a weakly prime, because it can be changed into another prime (238086521) 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, 119042760 + 119042761.

It is an arithmetic number, because the mean of its divisors is an integer number (119042761).

Almost surely, 2^238085521 is an apocalyptic number.

It is an amenable number.

238085521 is a deficient number, since it is larger than the sum of its proper divisors (1).

238085521 is an equidigital number, since it uses as much as digits as its factorization.

238085521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 238085521 is about 15430.0201231236. The cubic root of 238085521 is about 619.7896624344.

The spelling of 238085521 in words is "two hundred thirty-eight million, eighty-five thousand, five hundred twenty-one".