121316989 has 2 divisors, whose sum is σ = 121316990. Its totient is φ = 121316988.

The previous prime is 121316971. The next prime is 121317017. The reversal of 121316989 is 989613121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120231225 + 1085764 = 10965^2 + 1042^2 .

It is a cyclic number.

It is not a de Polignac number, because 121316989 - 2⁹ = 121316477 is a prime.

It is a super-2 number, since 2×121316989² = 29435623640052242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121316189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60658494 + 60658495.

It is an arithmetic number, because the mean of its divisors is an integer number (60658495).

Almost surely, 2^121316989 is an apocalyptic number.

It is an amenable number.

121316989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121316989 is an equidigital number, since it uses as much as digits as its factorization.

121316989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The square root of 121316989 is about 11014.3991665456. The cubic root of 121316989 is about 495.0402837671.

The spelling of 121316989 in words is "one hundred twenty-one million, three hundred sixteen thousand, nine hundred eighty-nine".