3128231 has 4 divisors (see below), whose sum is σ = 3135000. Its totient is φ = 3121464.

The previous prime is 3128227. The next prime is 3128233. The reversal of 3128231 is 1328213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3128231 - 2² = 3128227 is a prime.

It is a super-2 number, since 2×3128231² = 19571658378722, 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 (3128233) 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, 2636 + ... + 3633.

It is an arithmetic number, because the mean of its divisors is an integer number (783750).

Almost surely, 2^3128231 is an apocalyptic number.

3128231 is a deficient number, since it is larger than the sum of its proper divisors (6769).

3128231 is an equidigital number, since it uses as much as digits as its factorization.

3128231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6768.

The product of its digits is 288, while the sum is 20.

The square root of 3128231 is about 1768.6805816766. The cubic root of 3128231 is about 146.2512562290.

It can be divided in two parts, 31282 and 31, that added together give a palindrome (31313).

The spelling of 3128231 in words is "three million, one hundred twenty-eight thousand, two hundred thirty-one".