128972533 has 2 divisors, whose sum is σ = 128972534. Its totient is φ = 128972532.

The previous prime is 128972527. The next prime is 128972567. The reversal of 128972533 is 335279821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108014449 + 20958084 = 10393^2 + 4578^2 .

It is a cyclic number.

It is not a de Polignac number, because 128972533 - 2⁹ = 128972021 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128970533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64486266 + 64486267.

It is an arithmetic number, because the mean of its divisors is an integer number (64486267).

Almost surely, 2^128972533 is an apocalyptic number.

It is an amenable number.

128972533 is a deficient number, since it is larger than the sum of its proper divisors (1).

128972533 is an equidigital number, since it uses as much as digits as its factorization.

128972533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 128972533 is about 11356.6074599768. The cubic root of 128972533 is about 505.2415705337.

The spelling of 128972533 in words is "one hundred twenty-eight million, nine hundred seventy-two thousand, five hundred thirty-three".