16128231 has 16 divisors (see below), whose sum is σ = 24711168. Its totient is φ = 9165600.

The previous prime is 16128227. The next prime is 16128317. The reversal of 16128231 is 13282161.

It is not a de Polignac number, because 16128231 - 2² = 16128227 is a prime.

It is a super-2 number, since 2×16128231² = 520239670378722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16128731) 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, 2001 + ... + 6021.

It is an arithmetic number, because the mean of its divisors is an integer number (1544448).

Almost surely, 2^16128231 is an apocalyptic number.

16128231 is a deficient number, since it is larger than the sum of its proper divisors (8582937).

16128231 is a wasteful number, since it uses less digits than its factorization.

16128231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222.

The product of its digits is 576, while the sum is 24.

The square root of 16128231 is about 4015.9968874490. The cubic root of 16128231 is about 252.6555901497.

The spelling of 16128231 in words is "sixteen million, one hundred twenty-eight thousand, two hundred thirty-one".