121140191 has 2 divisors, whose sum is σ = 121140192. Its totient is φ = 121140190.

The previous prime is 121140169. The next prime is 121140193. The reversal of 121140191 is 191041121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121140191 - 2¹⁸ = 120878047 is a prime.

It is a super-3 number, since 3×121140191³ (a number of 25 digits) contains 333 as substring.

Together with 121140193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121140193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60570095 + 60570096.

It is an arithmetic number, because the mean of its divisors is an integer number (60570096).

Almost surely, 2^121140191 is an apocalyptic number.

121140191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121140191 is an equidigital number, since it uses as much as digits as its factorization.

121140191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 121140191 is about 11006.3704735031. The cubic root of 121140191 is about 494.7996890429.

The spelling of 121140191 in words is "one hundred twenty-one million, one hundred forty thousand, one hundred ninety-one".