128444651 has 2 divisors, whose sum is σ = 128444652. Its totient is φ = 128444650.

The previous prime is 128444633. The next prime is 128444663. The reversal of 128444651 is 156444821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128444651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128444671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64222325 + 64222326.

It is an arithmetic number, because the mean of its divisors is an integer number (64222326).

Almost surely, 2^128444651 is an apocalyptic number.

128444651 is a deficient number, since it is larger than the sum of its proper divisors (1).

128444651 is an equidigital number, since it uses as much as digits as its factorization.

128444651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 35.

The square root of 128444651 is about 11333.3424460748. The cubic root of 128444651 is about 504.5513133889.

The spelling of 128444651 in words is "one hundred twenty-eight million, four hundred forty-four thousand, six hundred fifty-one".