121311187 has 2 divisors, whose sum is σ = 121311188. Its totient is φ = 121311186.

The previous prime is 121311149. The next prime is 121311193. The reversal of 121311187 is 781113121.

It is a strong prime.

It is an emirp because it is prime and its reverse (781113121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121311187 - 2⁷ = 121311059 is a prime.

It is not a weakly prime, because it can be changed into another prime (121311137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60655593 + 60655594.

It is an arithmetic number, because the mean of its divisors is an integer number (60655594).

Almost surely, 2^121311187 is an apocalyptic number.

121311187 is a deficient number, since it is larger than the sum of its proper divisors (1).

121311187 is an equidigital number, since it uses as much as digits as its factorization.

121311187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 25.

The square root of 121311187 is about 11014.1357808954. The cubic root of 121311187 is about 495.0323918537.

The spelling of 121311187 in words is "one hundred twenty-one million, three hundred eleven thousand, one hundred eighty-seven".