7681231 has 2 divisors, whose sum is σ = 7681232. Its totient is φ = 7681230.

The previous prime is 7681213. The next prime is 7681243. The reversal of 7681231 is 1321867.

Together with previous prime (7681213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1321867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7681231 - 2⁵ = 7681199 is a prime.

It is a super-2 number, since 2×7681231² = 118002619350722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7681231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7681031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840615 + 3840616.

It is an arithmetic number, because the mean of its divisors is an integer number (3840616).

Almost surely, 2^7681231 is an apocalyptic number.

7681231 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681231 is an equidigital number, since it uses as much as digits as its factorization.

7681231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 7681231 is about 2771.5033826427. The cubic root of 7681231 is about 197.3075067272.

The spelling of 7681231 in words is "seven million, six hundred eighty-one thousand, two hundred thirty-one".