121525909 has 2 divisors, whose sum is σ = 121525910. Its totient is φ = 121525908.

The previous prime is 121525903. The next prime is 121525931. The reversal of 121525909 is 909525121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121220100 + 305809 = 11010^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 121525909 - 2¹¹ = 121523861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121525903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60762954 + 60762955.

It is an arithmetic number, because the mean of its divisors is an integer number (60762955).

Almost surely, 2^121525909 is an apocalyptic number.

It is an amenable number.

121525909 is a deficient number, since it is larger than the sum of its proper divisors (1).

121525909 is an equidigital number, since it uses as much as digits as its factorization.

121525909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 121525909 is about 11023.8790359837. The cubic root of 121525909 is about 495.3242904424.

The spelling of 121525909 in words is "one hundred twenty-one million, five hundred twenty-five thousand, nine hundred nine".