128972527 has 2 divisors, whose sum is σ = 128972528. Its totient is φ = 128972526.

The previous prime is 128972449. The next prime is 128972533. The reversal of 128972527 is 725279821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128972527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128972567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64486263 + 64486264.

It is an arithmetic number, because the mean of its divisors is an integer number (64486264).

Almost surely, 2^128972527 is an apocalyptic number.

128972527 is a deficient number, since it is larger than the sum of its proper divisors (1).

128972527 is an equidigital number, since it uses as much as digits as its factorization.

128972527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 128972527 is about 11356.6071958134. The cubic root of 128972527 is about 505.2415626988.

The spelling of 128972527 in words is "one hundred twenty-eight million, nine hundred seventy-two thousand, five hundred twenty-seven".