123491 has 2 divisors, whose sum is σ = 123492. Its totient is φ = 123490.

The previous prime is 123479. The next prime is 123493. The reversal of 123491 is 194321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123491 - 2⁶ = 123427 is a prime.

Together with 123493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61745 + 61746.

It is an arithmetic number, because the mean of its divisors is an integer number (61746).

2¹²³⁴⁹¹ is an apocalyptic number.

123491 is a deficient number, since it is larger than the sum of its proper divisors (1).

123491 is an equidigital number, since it uses as much as digits as its factorization.

123491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 123491 is about 351.4128625990. The cubic root of 123491 is about 49.7979848972.

The spelling of 123491 in words is "one hundred twenty-three thousand, four hundred ninety-one".