7220831 has 4 divisors (see below), whose sum is σ = 7226232. Its totient is φ = 7215432.

The previous prime is 7220821. The next prime is 7220849. The reversal of 7220831 is 1380227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7220831 is a prime.

It is a super-2 number, since 2×7220831² = 104280800661122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7220797 and 7220806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220821) 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, 956 + ... + 3918.

It is an arithmetic number, because the mean of its divisors is an integer number (1806558).

Almost surely, 2^7220831 is an apocalyptic number.

7220831 is a deficient number, since it is larger than the sum of its proper divisors (5401).

7220831 is a wasteful number, since it uses less digits than its factorization.

7220831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 7220831 is about 2687.1603971479. The cubic root of 7220831 is about 193.2839208508.

The spelling of 7220831 in words is "seven million, two hundred twenty thousand, eight hundred thirty-one".