121668493 has 2 divisors, whose sum is σ = 121668494. Its totient is φ = 121668492.

The previous prime is 121668451. The next prime is 121668509. The reversal of 121668493 is 394866121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78464164 + 43204329 = 8858^2 + 6573^2 .

It is a cyclic number.

It is not a de Polignac number, because 121668493 - 2⁹ = 121667981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121668403) 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, 60834246 + 60834247.

It is an arithmetic number, because the mean of its divisors is an integer number (60834247).

Almost surely, 2^121668493 is an apocalyptic number.

It is an amenable number.

121668493 is a deficient number, since it is larger than the sum of its proper divisors (1).

121668493 is an equidigital number, since it uses as much as digits as its factorization.

121668493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 121668493 is about 11030.3441922725. The cubic root of 121668493 is about 495.5179328683.

The spelling of 121668493 in words is "one hundred twenty-one million, six hundred sixty-eight thousand, four hundred ninety-three".