128036641 has 2 divisors, whose sum is σ = 128036642. Its totient is φ = 128036640.

The previous prime is 128036633. The next prime is 128036677. The reversal of 128036641 is 146630821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 59213025 = 8296^2 + 7695^2 .

It is a cyclic number.

It is not a de Polignac number, because 128036641 - 2³ = 128036633 is a prime.

It is not a weakly prime, because it can be changed into another prime (128036681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64018320 + 64018321.

It is an arithmetic number, because the mean of its divisors is an integer number (64018321).

Almost surely, 2^128036641 is an apocalyptic number.

It is an amenable number.

128036641 is a deficient number, since it is larger than the sum of its proper divisors (1).

128036641 is an equidigital number, since it uses as much as digits as its factorization.

128036641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 128036641 is about 11315.3277018388. The cubic root of 128036641 is about 504.0165036693.

The spelling of 128036641 in words is "one hundred twenty-eight million, thirty-six thousand, six hundred forty-one".