123440101 has 2 divisors, whose sum is σ = 123440102. Its totient is φ = 123440100.

The previous prime is 123440099. The next prime is 123440113. The reversal of 123440101 is 101044321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 57017601 = 8150^2 + 7551^2 .

It is a cyclic number.

It is not a de Polignac number, because 123440101 - 2¹ = 123440099 is a prime.

Together with 123440099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123443101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61720050 + 61720051.

It is an arithmetic number, because the mean of its divisors is an integer number (61720051).

Almost surely, 2^123440101 is an apocalyptic number.

It is an amenable number.

123440101 is a deficient number, since it is larger than the sum of its proper divisors (1).

123440101 is an equidigital number, since it uses as much as digits as its factorization.

123440101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 123440101 is about 11110.3600751731. The cubic root of 123440101 is about 497.9114225023.

Adding to 123440101 its reverse (101044321), we get a palindrome (224484422).

The spelling of 123440101 in words is "one hundred twenty-three million, four hundred forty thousand, one hundred one".