121657229 has 2 divisors, whose sum is σ = 121657230. Its totient is φ = 121657228.

The previous prime is 121657199. The next prime is 121657231. The reversal of 121657229 is 922756121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121594729 + 62500 = 11027^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121657229 is a prime.

Together with 121657231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121657279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60828614 + 60828615.

It is an arithmetic number, because the mean of its divisors is an integer number (60828615).

Almost surely, 2^121657229 is an apocalyptic number.

It is an amenable number.

121657229 is a deficient number, since it is larger than the sum of its proper divisors (1).

121657229 is an equidigital number, since it uses as much as digits as its factorization.

121657229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 121657229 is about 11029.8335889532. The cubic root of 121657229 is about 495.5026408068.

The spelling of 121657229 in words is "one hundred twenty-one million, six hundred fifty-seven thousand, two hundred twenty-nine".