128340511 has 4 divisors (see below), whose sum is σ = 138212872. Its totient is φ = 118468152.

The previous prime is 128340479. The next prime is 128340521. The reversal of 128340511 is 115043821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115043821 = 31 ⋅3711091.

It is a cyclic number.

It is not a de Polignac number, because 128340511 - 2⁵ = 128340479 is a prime.

It is a super-2 number, since 2×128340511² = 32942573527482242, 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 (128340521) 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, 4936161 + ... + 4936186.

It is an arithmetic number, because the mean of its divisors is an integer number (34553218).

Almost surely, 2^128340511 is an apocalyptic number.

128340511 is a deficient number, since it is larger than the sum of its proper divisors (9872361).

128340511 is an equidigital number, since it uses as much as digits as its factorization.

128340511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9872360.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 128340511 is about 11328.7471063662. The cubic root of 128340511 is about 504.4149169456.

The spelling of 128340511 in words is "one hundred twenty-eight million, three hundred forty thousand, five hundred eleven".