128969471 has 4 divisors (see below), whose sum is σ = 129910992. Its totient is φ = 128027952.

The previous prime is 128969453. The next prime is 128969501. The reversal of 128969471 is 174969821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128969471 is a prime.

It is a super-3 number, since 3×128969471³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128969411) 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, 470555 + ... + 470828.

It is an arithmetic number, because the mean of its divisors is an integer number (32477748).

Almost surely, 2^128969471 is an apocalyptic number.

128969471 is a deficient number, since it is larger than the sum of its proper divisors (941521).

128969471 is an equidigital number, since it uses as much as digits as its factorization.

128969471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941520.

The product of its digits is 217728, while the sum is 47.

The square root of 128969471 is about 11356.4726477899. The cubic root of 128969471 is about 505.2375721063.

The spelling of 128969471 in words is "one hundred twenty-eight million, nine hundred sixty-nine thousand, four hundred seventy-one".