128315311 has 16 divisors (see below), whose sum is σ = 135235584. Its totient is φ = 121623264.

The previous prime is 128315309. The next prime is 128315323. The reversal of 128315311 is 113513821.

It is not a de Polignac number, because 128315311 - 2¹ = 128315309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128315351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349450 + ... + 349816.

It is an arithmetic number, because the mean of its divisors is an integer number (8452224).

Almost surely, 2^128315311 is an apocalyptic number.

128315311 is a deficient number, since it is larger than the sum of its proper divisors (6920273).

128315311 is a wasteful number, since it uses less digits than its factorization.

128315311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its digits is 720, while the sum is 25.

The square root of 128315311 is about 11327.6348369816. The cubic root of 128315311 is about 504.3819003820.

The spelling of 128315311 in words is "one hundred twenty-eight million, three hundred fifteen thousand, three hundred eleven".