128146121 has 2 divisors, whose sum is σ = 128146122. Its totient is φ = 128146120.

The previous prime is 128146097. The next prime is 128146147. The reversal of 128146121 is 121641821.

It is an a-pointer prime, because the next prime (128146147) can be obtained adding 128146121 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128142400 + 3721 = 11320^2 + 61^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128146121 is a prime.

It is not a weakly prime, because it can be changed into another prime (128140121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64073060 + 64073061.

It is an arithmetic number, because the mean of its divisors is an integer number (64073061).

Almost surely, 2^128146121 is an apocalyptic number.

It is an amenable number.

128146121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128146121 is an equidigital number, since it uses as much as digits as its factorization.

128146121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 26.

The square root of 128146121 is about 11320.1643539306. The cubic root of 128146121 is about 504.1601188261.

Adding to 128146121 its reverse (121641821), we get a palindrome (249787942).

The spelling of 128146121 in words is "one hundred twenty-eight million, one hundred forty-six thousand, one hundred twenty-one".