128131711 has 8 divisors (see below), whose sum is σ = 132395648. Its totient is φ = 123876000.

The previous prime is 128131709. The next prime is 128131727. The reversal of 128131711 is 117131821.

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

It is not a de Polignac number, because 128131711 - 2¹ = 128131709 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 (128101711) 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, 56581 + ... + 58801.

It is an arithmetic number, because the mean of its divisors is an integer number (16549456).

Almost surely, 2^128131711 is an apocalyptic number.

128131711 is a deficient number, since it is larger than the sum of its proper divisors (4263937).

128131711 is a wasteful number, since it uses less digits than its factorization.

128131711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113.

The product of its digits is 336, while the sum is 25.

The square root of 128131711 is about 11319.5278611787. The cubic root of 128131711 is about 504.1412205570.

The spelling of 128131711 in words is "one hundred twenty-eight million, one hundred thirty-one thousand, seven hundred eleven".