128972567 has 2 divisors, whose sum is σ = 128972568. Its totient is φ = 128972566.

The previous prime is 128972533. The next prime is 128972579. The reversal of 128972567 is 765279821.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (765279821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128972567 - 2¹⁸ = 128710423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128972527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64486283 + 64486284.

It is an arithmetic number, because the mean of its divisors is an integer number (64486284).

Almost surely, 2^128972567 is an apocalyptic number.

128972567 is a deficient number, since it is larger than the sum of its proper divisors (1).

128972567 is an equidigital number, since it uses as much as digits as its factorization.

128972567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 128972567 is about 11356.6089569026. The cubic root of 128972567 is about 505.2416149313.

The spelling of 128972567 in words is "one hundred twenty-eight million, nine hundred seventy-two thousand, five hundred sixty-seven".