121331191 has 2 divisors, whose sum is σ = 121331192. Its totient is φ = 121331190.

The previous prime is 121331167. The next prime is 121331213. The reversal of 121331191 is 191133121.

It is an a-pointer prime, because the next prime (121331213) can be obtained adding 121331191 to its sum of digits (22).

It is a strong prime.

It is an emirp because it is prime and its reverse (191133121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121331191 - 2⁹ = 121330679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121332191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60665595 + 60665596.

It is an arithmetic number, because the mean of its divisors is an integer number (60665596).

Almost surely, 2^121331191 is an apocalyptic number.

121331191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121331191 is an equidigital number, since it uses as much as digits as its factorization.

121331191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 22.

The square root of 121331191 is about 11015.0438492091. The cubic root of 121331191 is about 495.0596003466.

The spelling of 121331191 in words is "one hundred twenty-one million, three hundred thirty-one thousand, one hundred ninety-one".