121217149 has 2 divisors, whose sum is σ = 121217150. Its totient is φ = 121217148.

The previous prime is 121217147. The next prime is 121217219. The reversal of 121217149 is 941712121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 2951524 = 10875^2 + 1718^2 .

It is a cyclic number.

It is not a de Polignac number, because 121217149 - 2¹ = 121217147 is a prime.

Together with 121217147, it forms a pair of twin primes.

It is equal to p_6907051 and since 121217149 and 6907051 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121217141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608574 + 60608575.

It is an arithmetic number, because the mean of its divisors is an integer number (60608575).

Almost surely, 2^121217149 is an apocalyptic number.

It is an amenable number.

121217149 is a deficient number, since it is larger than the sum of its proper divisors (1).

121217149 is an equidigital number, since it uses as much as digits as its factorization.

121217149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

The square root of 121217149 is about 11009.8659846521. The cubic root of 121217149 is about 494.9044457258.

The spelling of 121217149 in words is "one hundred twenty-one million, two hundred seventeen thousand, one hundred forty-nine".