123405101 has 4 divisors (see below), whose sum is σ = 126740412. Its totient is φ = 120069792.

The previous prime is 123405083. The next prime is 123405157. The reversal of 123405101 is 101504321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101504321 = 29 ⋅3500149.

It can be written as a sum of positive squares in 2 ways, for example, as 82828201 + 40576900 = 9101^2 + 6370^2 .

It is a cyclic number.

It is not a de Polignac number, because 123405101 - 2²² = 119210797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123405101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123405001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667600 + ... + 1667673.

It is an arithmetic number, because the mean of its divisors is an integer number (31685103).

Almost surely, 2^123405101 is an apocalyptic number.

It is an amenable number.

123405101 is a deficient number, since it is larger than the sum of its proper divisors (3335311).

123405101 is an equidigital number, since it uses as much as digits as its factorization.

123405101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335310.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 123405101 is about 11108.7848570399. The cubic root of 123405101 is about 497.8643590630.

Adding to 123405101 its reverse (101504321), we get a palindrome (224909422).

It can be divided in two parts, 123 and 405101, that added together give a cube (405224 = 74³).

The spelling of 123405101 in words is "one hundred twenty-three million, four hundred five thousand, one hundred one".