123778273 has 2 divisors, whose sum is σ = 123778274. Its totient is φ = 123778272.

The previous prime is 123778261. The next prime is 123778301. The reversal of 123778273 is 372877321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107682129 + 16096144 = 10377^2 + 4012^2 .

It is an emirp because it is prime and its reverse (372877321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123778273 - 2¹⁷ = 123647201 is a prime.

It is not a weakly prime, because it can be changed into another prime (123778223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61889136 + 61889137.

It is an arithmetic number, because the mean of its divisors is an integer number (61889137).

Almost surely, 2^123778273 is an apocalyptic number.

It is an amenable number.

123778273 is a deficient number, since it is larger than the sum of its proper divisors (1).

123778273 is an equidigital number, since it uses as much as digits as its factorization.

123778273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 40.

The square root of 123778273 is about 11125.5684349160. The cubic root of 123778273 is about 498.3656945785.

The spelling of 123778273 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, two hundred seventy-three".