121678393 has 2 divisors, whose sum is σ = 121678394. Its totient is φ = 121678392.

The previous prime is 121678373. The next prime is 121678399. The reversal of 121678393 is 393876121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67699984 + 53978409 = 8228^2 + 7347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121678393 is a prime.

It is not a weakly prime, because it can be changed into another prime (121678399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60839196 + 60839197.

It is an arithmetic number, because the mean of its divisors is an integer number (60839197).

Almost surely, 2^121678393 is an apocalyptic number.

It is an amenable number.

121678393 is a deficient number, since it is larger than the sum of its proper divisors (1).

121678393 is an equidigital number, since it uses as much as digits as its factorization.

121678393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 121678393 is about 11030.7929452057. The cubic root of 121678393 is about 495.5313723775.

The spelling of 121678393 in words is "one hundred twenty-one million, six hundred seventy-eight thousand, three hundred ninety-three".