128435551 has 2 divisors, whose sum is σ = 128435552. Its totient is φ = 128435550.

The previous prime is 128435533. The next prime is 128435557. The reversal of 128435551 is 155534821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128435551 - 2⁷ = 128435423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128435557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64217775 + 64217776.

It is an arithmetic number, because the mean of its divisors is an integer number (64217776).

Almost surely, 2^128435551 is an apocalyptic number.

128435551 is a deficient number, since it is larger than the sum of its proper divisors (1).

128435551 is an equidigital number, since it uses as much as digits as its factorization.

128435551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 34.

The square root of 128435551 is about 11332.9409686983. The cubic root of 128435551 is about 504.5393976848.

The spelling of 128435551 in words is "one hundred twenty-eight million, four hundred thirty-five thousand, five hundred fifty-one".