121605193 has 2 divisors, whose sum is σ = 121605194. Its totient is φ = 121605192.

The previous prime is 121605137. The next prime is 121605203. The reversal of 121605193 is 391506121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71436304 + 50168889 = 8452^2 + 7083^2 .

It is an emirp because it is prime and its reverse (391506121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121605193 is a prime.

It is not a weakly prime, because it can be changed into another prime (121605103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60802596 + 60802597.

It is an arithmetic number, because the mean of its divisors is an integer number (60802597).

Almost surely, 2^121605193 is an apocalyptic number.

It is an amenable number.

121605193 is a deficient number, since it is larger than the sum of its proper divisors (1).

121605193 is an equidigital number, since it uses as much as digits as its factorization.

121605193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 121605193 is about 11027.4744615438. The cubic root of 121605193 is about 495.4319842234.

The spelling of 121605193 in words is "one hundred twenty-one million, six hundred five thousand, one hundred ninety-three".