128161311 has 16 divisors (see below), whose sum is σ = 172585728. Its totient is φ = 84593600.

The previous prime is 128161309. The next prime is 128161331. The reversal of 128161311 is 113161821.

It is a cyclic number.

It is not a de Polignac number, because 128161311 - 2¹ = 128161309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128161331) 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, 245731 + ... + 246251.

It is an arithmetic number, because the mean of its divisors is an integer number (10786608).

Almost surely, 2^128161311 is an apocalyptic number.

128161311 is a deficient number, since it is larger than the sum of its proper divisors (44424417).

128161311 is a wasteful number, since it uses less digits than its factorization.

128161311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

The product of its digits is 288, while the sum is 24.

The square root of 128161311 is about 11320.8352607040. The cubic root of 128161311 is about 504.1800385073.

The spelling of 128161311 in words is "one hundred twenty-eight million, one hundred sixty-one thousand, three hundred eleven".