123091 has 2 divisors, whose sum is σ = 123092. Its totient is φ = 123090.

The previous prime is 123083. The next prime is 123113. The reversal of 123091 is 190321.

It is a weak prime.

It is an emirp because it is prime and its reverse (190321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123091 - 2³ = 123083 is a prime.

It is equal to p₁₁₅₇₂ and since 123091 and 11572 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (123001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61545 + 61546.

It is an arithmetic number, because the mean of its divisors is an integer number (61546).

2¹²³⁰⁹¹ is an apocalyptic number.

123091 is a deficient number, since it is larger than the sum of its proper divisors (1).

123091 is an equidigital number, since it uses as much as digits as its factorization.

123091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 123091 is about 350.8432698514. The cubic root of 123091 is about 49.7441598154.

The spelling of 123091 in words is "one hundred twenty-three thousand, ninety-one".