7128331 has 8 divisors (see below), whose sum is σ = 8268800. Its totient is φ = 6018408.

The previous prime is 7128307. The next prime is 7128347. The reversal of 7128331 is 1338217.

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

It is a cyclic number.

It is not a de Polignac number, because 7128331 - 2⁹ = 7127819 is a prime.

It is a super-2 number, since 2×7128331² = 101626205691122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

7128331 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7128296 and 7128305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7131 + ... + 8068.

It is an arithmetic number, because the mean of its divisors is an integer number (1033600).

Almost surely, 2^7128331 is an apocalyptic number.

7128331 is a deficient number, since it is larger than the sum of its proper divisors (1140469).

7128331 is a wasteful number, since it uses less digits than its factorization.

7128331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15273.

The product of its digits is 1008, while the sum is 25.

The square root of 7128331 is about 2669.8934435666. The cubic root of 7128331 is about 192.4550386927.

The spelling of 7128331 in words is "seven million, one hundred twenty-eight thousand, three hundred thirty-one".