121646389 has 2 divisors, whose sum is σ = 121646390. Its totient is φ = 121646388.

The previous prime is 121646381. The next prime is 121646401. The reversal of 121646389 is 983646121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120626289 + 1020100 = 10983^2 + 1010^2 .

It is an emirp because it is prime and its reverse (983646121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121646389 - 2³ = 121646381 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121646381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60823194 + 60823195.

It is an arithmetic number, because the mean of its divisors is an integer number (60823195).

Almost surely, 2^121646389 is an apocalyptic number.

It is an amenable number.

121646389 is a deficient number, since it is larger than the sum of its proper divisors (1).

121646389 is an equidigital number, since it uses as much as digits as its factorization.

121646389 is an evil number, because the sum of its binary digits is even.

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

The square root of 121646389 is about 11029.3421834668. The cubic root of 121646389 is about 495.4879234784.

The spelling of 121646389 in words is "one hundred twenty-one million, six hundred forty-six thousand, three hundred eighty-nine".