123455779 has 2 divisors, whose sum is σ = 123455780. Its totient is φ = 123455778.

The previous prime is 123455771. The next prime is 123455803. The reversal of 123455779 is 977554321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123455779 - 2³ = 123455771 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (123455771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61727889 + 61727890.

It is an arithmetic number, because the mean of its divisors is an integer number (61727890).

Almost surely, 2^123455779 is an apocalyptic number.

123455779 is a deficient number, since it is larger than the sum of its proper divisors (1).

123455779 is an equidigital number, since it uses as much as digits as its factorization.

123455779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 43.

The square root of 123455779 is about 11111.0656104624. The cubic root of 123455779 is about 497.9325013488.

The spelling of 123455779 in words is "one hundred twenty-three million, four hundred fifty-five thousand, seven hundred seventy-nine".