7211231 has 2 divisors, whose sum is σ = 7211232. Its totient is φ = 7211230.

The previous prime is 7211201. The next prime is 7211249. The reversal of 7211231 is 1321127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7211231 - 2¹⁰ = 7210207 is a prime.

It is a super-2 number, since 2×7211231² = 104003705070722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3605615 + 3605616.

It is an arithmetic number, because the mean of its divisors is an integer number (3605616).

Almost surely, 2^7211231 is an apocalyptic number.

7211231 is a deficient number, since it is larger than the sum of its proper divisors (1).

7211231 is an equidigital number, since it uses as much as digits as its factorization.

7211231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84, while the sum is 17.

The square root of 7211231 is about 2685.3735308147. The cubic root of 7211231 is about 193.1982267182.

Adding to 7211231 its reverse (1321127), we get a palindrome (8532358).

The spelling of 7211231 in words is "seven million, two hundred eleven thousand, two hundred thirty-one".