121952609 has 2 divisors, whose sum is σ = 121952610. Its totient is φ = 121952608.

The previous prime is 121952591. The next prime is 121952641. The reversal of 121952609 is 906259121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114554209 + 7398400 = 10703^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 121952609 - 2⁸ = 121952353 is a prime.

It is not a weakly prime, because it can be changed into another prime (121952689) 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, 60976304 + 60976305.

It is an arithmetic number, because the mean of its divisors is an integer number (60976305).

Almost surely, 2^121952609 is an apocalyptic number.

It is an amenable number.

121952609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121952609 is an equidigital number, since it uses as much as digits as its factorization.

121952609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 121952609 is about 11043.2155190415. The cubic root of 121952609 is about 495.9033383978.

The spelling of 121952609 in words is "one hundred twenty-one million, nine hundred fifty-two thousand, six hundred nine".