121423909 has 2 divisors, whose sum is σ = 121423910. Its totient is φ = 121423908.

The previous prime is 121423891. The next prime is 121423943. The reversal of 121423909 is 909324121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110880900 + 10543009 = 10530^2 + 3247^2 .

It is an emirp because it is prime and its reverse (909324121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121423909 - 2¹⁵ = 121391141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121423949) 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, 60711954 + 60711955.

It is an arithmetic number, because the mean of its divisors is an integer number (60711955).

Almost surely, 2^121423909 is an apocalyptic number.

It is an amenable number.

121423909 is a deficient number, since it is larger than the sum of its proper divisors (1).

121423909 is an equidigital number, since it uses as much as digits as its factorization.

121423909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 121423909 is about 11019.2517441068. The cubic root of 121423909 is about 495.1856719377.

The spelling of 121423909 in words is "one hundred twenty-one million, four hundred twenty-three thousand, nine hundred nine".