128288513 has 4 divisors (see below), whose sum is σ = 135040560. Its totient is φ = 121536468.

The previous prime is 128288497. The next prime is 128288519. The reversal of 128288513 is 315882821.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 315882821 = 521 ⋅606301.

It is a cyclic number.

It is not a de Polignac number, because 128288513 - 2⁴ = 128288497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128288519) 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, 3375995 + ... + 3376032.

It is an arithmetic number, because the mean of its divisors is an integer number (33760140).

Almost surely, 2^128288513 is an apocalyptic number.

It is an amenable number.

128288513 is a deficient number, since it is larger than the sum of its proper divisors (6752047).

128288513 is an equidigital number, since it uses as much as digits as its factorization.

128288513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752046.

The product of its digits is 30720, while the sum is 38.

The square root of 128288513 is about 11326.4519157590. The cubic root of 128288513 is about 504.3467854059.

The spelling of 128288513 in words is "one hundred twenty-eight million, two hundred eighty-eight thousand, five hundred thirteen".