191123 has 2 divisors, whose sum is σ = 191124. Its totient is φ = 191122.

The previous prime is 191119. The next prime is 191137. The reversal of 191123 is 321191.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191123 - 2² = 191119 is a prime.

It is a super-3 number, since 3×191123³ = 20944023479333601, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (191143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95561 + 95562.

It is an arithmetic number, because the mean of its divisors is an integer number (95562).

2¹⁹¹¹²³ is an apocalyptic number.

191123 is a deficient number, since it is larger than the sum of its proper divisors (1).

191123 is an equidigital number, since it uses as much as digits as its factorization.

191123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 17.

The square root of 191123 is about 437.1761658645. The cubic root of 191123 is about 57.6020117289.

The spelling of 191123 in words is "one hundred ninety-one thousand, one hundred twenty-three".