123431401 has 2 divisors, whose sum is σ = 123431402. Its totient is φ = 123431400.

The previous prime is 123431381. The next prime is 123431431. The reversal of 123431401 is 104134321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98029801 + 25401600 = 9901^2 + 5040^2 .

It is an emirp because it is prime and its reverse (104134321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123431401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123431431) 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, 61715700 + 61715701.

It is an arithmetic number, because the mean of its divisors is an integer number (61715701).

Almost surely, 2^123431401 is an apocalyptic number.

It is an amenable number.

123431401 is a deficient number, since it is larger than the sum of its proper divisors (1).

123431401 is an equidigital number, since it uses as much as digits as its factorization.

123431401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 123431401 is about 11109.9685418096. The cubic root of 123431401 is about 497.8997247069.

Adding to 123431401 its reverse (104134321), we get a palindrome (227565722).

The spelling of 123431401 in words is "one hundred twenty-three million, four hundred thirty-one thousand, four hundred one".