185238121 has 2 divisors, whose sum is σ = 185238122. Its totient is φ = 185238120.

The previous prime is 185238101. The next prime is 185238149. The reversal of 185238121 is 121832581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 81198121 = 10200^2 + 9011^2 .

It is a cyclic number.

It is not a de Polignac number, because 185238121 - 2⁵ = 185238089 is a prime.

It is a super-2 number, since 2×185238121² = 68626322943221282, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (185238101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92619060 + 92619061.

It is an arithmetic number, because the mean of its divisors is an integer number (92619061).

Almost surely, 2^185238121 is an apocalyptic number.

It is an amenable number.

185238121 is a deficient number, since it is larger than the sum of its proper divisors (1).

185238121 is an equidigital number, since it uses as much as digits as its factorization.

185238121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 31.

The square root of 185238121 is about 13610.2211958513. The cubic root of 185238121 is about 570.0462884334.

The spelling of 185238121 in words is "one hundred eighty-five million, two hundred thirty-eight thousand, one hundred twenty-one".