121555429 has 2 divisors, whose sum is σ = 121555430. Its totient is φ = 121555428.

The previous prime is 121555411. The next prime is 121555463. The reversal of 121555429 is 924555121.

It is an a-pointer prime, because the next prime (121555463) can be obtained adding 121555429 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120494529 + 1060900 = 10977^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 121555429 - 2¹¹ = 121553381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121555394 and 121555403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121555229) 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, 60777714 + 60777715.

It is an arithmetic number, because the mean of its divisors is an integer number (60777715).

Almost surely, 2^121555429 is an apocalyptic number.

It is an amenable number.

121555429 is a deficient number, since it is larger than the sum of its proper divisors (1).

121555429 is an equidigital number, since it uses as much as digits as its factorization.

121555429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 34.

The square root of 121555429 is about 11025.2178663281. The cubic root of 121555429 is about 495.3643937953.

It can be divided in two parts, 1215 and 55429, that added together give a square (56644 = 238²).

The spelling of 121555429 in words is "one hundred twenty-one million, five hundred fifty-five thousand, four hundred twenty-nine".