40123121 has 2 divisors, whose sum is σ = 40123122. Its totient is φ = 40123120.

The previous prime is 40123099. The next prime is 40123141. The reversal of 40123121 is 12132104.

40123121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32615521 + 7507600 = 5711^2 + 2740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40123121 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40123096 and 40123105.

It is not a weakly prime, because it can be changed into another prime (40123141) 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 as a sum of consecutive naturals, namely, 20061560 + 20061561.

It is an arithmetic number, because the mean of its divisors is an integer number (20061561).

Almost surely, 2^40123121 is an apocalyptic number.

It is an amenable number.

40123121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40123121 is an equidigital number, since it uses as much as digits as its factorization.

40123121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 40123121 is about 6334.2814114941. The cubic root of 40123121 is about 342.3457198480.

Adding to 40123121 its reverse (12132104), we get a palindrome (52255225).

The spelling of 40123121 in words is "forty million, one hundred twenty-three thousand, one hundred twenty-one".