121551229 has 2 divisors, whose sum is σ = 121551230. Its totient is φ = 121551228.

The previous prime is 121551197. The next prime is 121551233. The reversal of 121551229 is 922155121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 12766329 = 10430^2 + 3573^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551229 - 2⁵ = 121551197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121551197 and 121551206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121551299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775614 + 60775615.

It is an arithmetic number, because the mean of its divisors is an integer number (60775615).

Almost surely, 2^121551229 is an apocalyptic number.

It is an amenable number.

121551229 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551229 is an equidigital number, since it uses as much as digits as its factorization.

121551229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

The square root of 121551229 is about 11025.0273922562. The cubic root of 121551229 is about 495.3586884299.

The spelling of 121551229 in words is "one hundred twenty-one million, five hundred fifty-one thousand, two hundred twenty-nine".