123405311 has 2 divisors, whose sum is σ = 123405312. Its totient is φ = 123405310.

The previous prime is 123405299. The next prime is 123405319. The reversal of 123405311 is 113504321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123405311 - 2²⁶ = 56296447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123405319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61702655 + 61702656.

It is an arithmetic number, because the mean of its divisors is an integer number (61702656).

Almost surely, 2^123405311 is an apocalyptic number.

123405311 is a deficient number, since it is larger than the sum of its proper divisors (1).

123405311 is an equidigital number, since it uses as much as digits as its factorization.

123405311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 123405311 is about 11108.7943090148. The cubic root of 123405311 is about 497.8646414702.

Adding to 123405311 its reverse (113504321), we get a palindrome (236909632).

The spelling of 123405311 in words is "one hundred twenty-three million, four hundred five thousand, three hundred eleven".