7123231 has 2 divisors, whose sum is σ = 7123232. Its totient is φ = 7123230.

The previous prime is 7123229. The next prime is 7123279. The reversal of 7123231 is 1323217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7123231 - 2¹ = 7123229 is a prime.

It is a super-2 number, since 2×7123231² = 101480839758722, which contains 22 as substring.

Together with 7123229, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7123199 and 7123208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7123201) 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, 3561615 + 3561616.

It is an arithmetic number, because the mean of its divisors is an integer number (3561616).

Almost surely, 2^7123231 is an apocalyptic number.

7123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

7123231 is an equidigital number, since it uses as much as digits as its factorization.

7123231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 19.

The square root of 7123231 is about 2668.9381783773. The cubic root of 7123231 is about 192.4091301030.

Adding to 7123231 its reverse (1323217), we get a palindrome (8446448).

The spelling of 7123231 in words is "seven million, one hundred twenty-three thousand, two hundred thirty-one".