123777641 has 4 divisors (see below), whose sum is σ = 133299012. Its totient is φ = 114256272.

The previous prime is 123777623. The next prime is 123777653. The reversal of 123777641 is 146777321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146777321 = 229 ⋅640949.

It can be written as a sum of positive squares in 2 ways, for example, as 51782416 + 71995225 = 7196^2 + 8485^2 .

It is not a de Polignac number, because 123777641 - 2¹⁰ = 123776617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123777595 and 123777604.

It is not an unprimeable number, because it can be changed into a prime (123777611) 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 in 3 ways as a sum of consecutive naturals, for example, 4760666 + ... + 4760691.

It is an arithmetic number, because the mean of its divisors is an integer number (33324753).

Almost surely, 2^123777641 is an apocalyptic number.

It is an amenable number.

123777641 is a deficient number, since it is larger than the sum of its proper divisors (9521371).

123777641 is an equidigital number, since it uses as much as digits as its factorization.

123777641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9521370.

The product of its digits is 49392, while the sum is 38.

The square root of 123777641 is about 11125.5400318367. The cubic root of 123777641 is about 498.3648463745.

The spelling of 123777641 in words is "one hundred twenty-three million, seven hundred seventy-seven thousand, six hundred forty-one".