231126191 has 2 divisors, whose sum is σ = 231126192. Its totient is φ = 231126190.

The previous prime is 231126167. The next prime is 231126193. The reversal of 231126191 is 191621132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231126191 - 2²⁶ = 164017327 is a prime.

It is a super-3 number, since 3×231126191³ (a number of 26 digits) contains 333 as substring.

Together with 231126193, it forms a pair of twin primes.

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 231126191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231126193) 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, 115563095 + 115563096.

It is an arithmetic number, because the mean of its divisors is an integer number (115563096).

Almost surely, 2^231126191 is an apocalyptic number.

231126191 is a deficient number, since it is larger than the sum of its proper divisors (1).

231126191 is an equidigital number, since it uses as much as digits as its factorization.

231126191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

The square root of 231126191 is about 15202.8349658871. The cubic root of 231126191 is about 613.6909526003.

The spelling of 231126191 in words is "two hundred thirty-one million, one hundred twenty-six thousand, one hundred ninety-one".