121525140409 has 2 divisors, whose sum is σ = 121525140410. Its totient is φ = 121525140408.

The previous prime is 121525140383. The next prime is 121525140427. The reversal of 121525140409 is 904041525121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114457039225 + 7068101184 = 338315^2 + 84072^2 .

It is a cyclic number.

It is not a de Polignac number, because 121525140409 - 2⁵ = 121525140377 is a prime.

It is not a weakly prime, because it can be changed into another prime (121525143409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60762570204 + 60762570205.

It is an arithmetic number, because the mean of its divisors is an integer number (60762570205).

Almost surely, 2^121525140409 is an apocalyptic number.

It is an amenable number.

121525140409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121525140409 is an equidigital number, since it uses as much as digits as its factorization.

121525140409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 121525140409 in words is "one hundred twenty-one billion, five hundred twenty-five million, one hundred forty thousand, four hundred nine".