121425191 has 2 divisors, whose sum is σ = 121425192. Its totient is φ = 121425190.

The previous prime is 121425179. The next prime is 121425209. The reversal of 121425191 is 191524121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121425191 - 2¹⁸ = 121163047 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121425191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121425121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60712595 + 60712596.

It is an arithmetic number, because the mean of its divisors is an integer number (60712596).

Almost surely, 2^121425191 is an apocalyptic number.

121425191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121425191 is an equidigital number, since it uses as much as digits as its factorization.

121425191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 121425191 is about 11019.3099148722. The cubic root of 121425191 is about 495.1874146637.

The spelling of 121425191 in words is "one hundred twenty-one million, four hundred twenty-five thousand, one hundred ninety-one".