128522969 has 4 divisors (see below), whose sum is σ = 128664960. Its totient is φ = 128380980.

The previous prime is 128522959. The next prime is 128522971. The reversal of 128522969 is 969225821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128522969 is a prime.

It is a super-2 number, since 2×128522969² = 33036307121149922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128522909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69629 + ... + 71450.

It is an arithmetic number, because the mean of its divisors is an integer number (32166240).

Almost surely, 2^128522969 is an apocalyptic number.

It is an amenable number.

128522969 is a deficient number, since it is larger than the sum of its proper divisors (141991).

128522969 is an equidigital number, since it uses as much as digits as its factorization.

128522969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141990.

The product of its digits is 155520, while the sum is 44.

The square root of 128522969 is about 11336.7971226445. The cubic root of 128522969 is about 504.6538411334.

The spelling of 128522969 in words is "one hundred twenty-eight million, five hundred twenty-two thousand, nine hundred sixty-nine".