7181231 has 2 divisors, whose sum is σ = 7181232. Its totient is φ = 7181230.

The previous prime is 7181227. The next prime is 7181249. The reversal of 7181231 is 1321817.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7181231 - 2² = 7181227 is a prime.

It is a super-2 number, since 2×7181231² = 103140157350722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7181197 and 7181206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7181131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3590615 + 3590616.

It is an arithmetic number, because the mean of its divisors is an integer number (3590616).

Almost surely, 2^7181231 is an apocalyptic number.

7181231 is a deficient number, since it is larger than the sum of its proper divisors (1).

7181231 is an equidigital number, since it uses as much as digits as its factorization.

7181231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 23.

The square root of 7181231 is about 2679.7818941100. The cubic root of 7181231 is about 192.9299413719.

The spelling of 7181231 in words is "seven million, one hundred eighty-one thousand, two hundred thirty-one".