123489791 has 2 divisors, whose sum is σ = 123489792. Its totient is φ = 123489790.

The previous prime is 123489781. The next prime is 123489857. The reversal of 123489791 is 197984321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123489791 - 2¹⁰ = 123488767 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123489701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61744895 + 61744896.

It is an arithmetic number, because the mean of its divisors is an integer number (61744896).

Almost surely, 2^123489791 is an apocalyptic number.

123489791 is a deficient number, since it is larger than the sum of its proper divisors (1).

123489791 is an equidigital number, since it uses as much as digits as its factorization.

123489791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 123489791 is about 11112.5960513284. The cubic root of 123489791 is about 497.9782238614.

The spelling of 123489791 in words is "one hundred twenty-three million, four hundred eighty-nine thousand, seven hundred ninety-one".