128643337 has 2 divisors, whose sum is σ = 128643338. Its totient is φ = 128643336.

The previous prime is 128643329. The next prime is 128643341. The reversal of 128643337 is 733346821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111429136 + 17214201 = 10556^2 + 4149^2 .

It is a cyclic number.

It is not a de Polignac number, because 128643337 - 2³ = 128643329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128643296 and 128643305.

It is not a weakly prime, because it can be changed into another prime (128643637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64321668 + 64321669.

It is an arithmetic number, because the mean of its divisors is an integer number (64321669).

Almost surely, 2^128643337 is an apocalyptic number.

It is an amenable number.

128643337 is a deficient number, since it is larger than the sum of its proper divisors (1).

128643337 is an equidigital number, since it uses as much as digits as its factorization.

128643337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 128643337 is about 11342.1046106973. The cubic root of 128643337 is about 504.8113362504.

The spelling of 128643337 in words is "one hundred twenty-eight million, six hundred forty-three thousand, three hundred thirty-seven".