128738611 has 2 divisors, whose sum is σ = 128738612. Its totient is φ = 128738610.

The previous prime is 128738581. The next prime is 128738657. The reversal of 128738611 is 116837821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128738611 - 2²⁵ = 95184179 is a prime.

It is not a weakly prime, because it can be changed into another prime (128738111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64369305 + 64369306.

It is an arithmetic number, because the mean of its divisors is an integer number (64369306).

Almost surely, 2^128738611 is an apocalyptic number.

128738611 is a deficient number, since it is larger than the sum of its proper divisors (1).

128738611 is an equidigital number, since it uses as much as digits as its factorization.

128738611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 128738611 is about 11346.3038475091. The cubic root of 128738611 is about 504.9359275637.

The spelling of 128738611 in words is "one hundred twenty-eight million, seven hundred thirty-eight thousand, six hundred eleven".