128197525 has 6 divisors (see below), whose sum is σ = 158964962. Its totient is φ = 102558000.

The previous prime is 128197523. The next prime is 128197543. The reversal of 128197525 is 525791821.

It can be written as a sum of positive squares in 3 ways, for example, as 1162084 + 127035441 = 1078^2 + 11271^2 .

It is not a de Polignac number, because 128197525 - 2¹ = 128197523 is a prime.

It is a super-2 number, since 2×128197525² = 32869210832251250, which contains 22 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 (128197523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2563926 + ... + 2563975.

Almost surely, 2^128197525 is an apocalyptic number.

It is an amenable number.

128197525 is a deficient number, since it is larger than the sum of its proper divisors (30767437).

128197525 is an equidigital number, since it uses as much as digits as its factorization.

128197525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127911 (or 5127906 counting only the distinct ones).

The product of its digits is 50400, while the sum is 40.

The square root of 128197525 is about 11322.4345880204. The cubic root of 128197525 is about 504.2275220427.

The spelling of 128197525 in words is "one hundred twenty-eight million, one hundred ninety-seven thousand, five hundred twenty-five".