128969497 has 8 divisors (see below), whose sum is σ = 136842912. Its totient is φ = 121128000.

The previous prime is 128969453. The next prime is 128969501. The reversal of 128969497 is 794969821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128969497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128969417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622 + ... + 16072.

It is an arithmetic number, because the mean of its divisors is an integer number (17105364).

Almost surely, 2^128969497 is an apocalyptic number.

128969497 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128969497 is a deficient number, since it is larger than the sum of its proper divisors (7873415).

128969497 is a wasteful number, since it uses less digits than its factorization.

128969497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15959.

The product of its digits is 1959552, while the sum is 55.

The square root of 128969497 is about 11356.4737925115. The cubic root of 128969497 is about 505.2376060579.

The spelling of 128969497 in words is "one hundred twenty-eight million, nine hundred sixty-nine thousand, four hundred ninety-seven".