121286689 has 2 divisors, whose sum is σ = 121286690. Its totient is φ = 121286688.

The previous prime is 121286677. The next prime is 121286707. The reversal of 121286689 is 986682121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118701025 + 2585664 = 10895^2 + 1608^2 .

It is an emirp because it is prime and its reverse (986682121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121286689 - 2²³ = 112898081 is a prime.

It is not a weakly prime, because it can be changed into another prime (121286609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60643344 + 60643345.

It is an arithmetic number, because the mean of its divisors is an integer number (60643345).

Almost surely, 2^121286689 is an apocalyptic number.

It is an amenable number.

121286689 is a deficient number, since it is larger than the sum of its proper divisors (1).

121286689 is an equidigital number, since it uses as much as digits as its factorization.

121286689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 121286689 is about 11013.0236084374. The cubic root of 121286689 is about 494.9990667601. Note that the first 3 decimals are identical.

The spelling of 121286689 in words is "one hundred twenty-one million, two hundred eighty-six thousand, six hundred eighty-nine".