121139191 has 2 divisors, whose sum is σ = 121139192. Its totient is φ = 121139190.

The previous prime is 121139173. The next prime is 121139197. The reversal of 121139191 is 191931121.

It is a strong prime.

It is an emirp because it is prime and its reverse (191931121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121139191 - 2⁷ = 121139063 is a prime.

It is a super-3 number, since 3×121139191³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121139197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60569595 + 60569596.

It is an arithmetic number, because the mean of its divisors is an integer number (60569596).

Almost surely, 2^121139191 is an apocalyptic number.

121139191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121139191 is an equidigital number, since it uses as much as digits as its factorization.

121139191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 28.

The square root of 121139191 is about 11006.3250451729. The cubic root of 121139191 is about 494.7983275320.

The spelling of 121139191 in words is "one hundred twenty-one million, one hundred thirty-nine thousand, one hundred ninety-one".