8315231 has 2 divisors, whose sum is σ = 8315232. Its totient is φ = 8315230.

The previous prime is 8315221. The next prime is 8315239. The reversal of 8315231 is 1325138.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8315231 - 2¹⁴ = 8298847 is a prime.

It is a super-2 number, since 2×8315231² = 138286133166722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8315197 and 8315206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8315239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4157615 + 4157616.

It is an arithmetic number, because the mean of its divisors is an integer number (4157616).

Almost surely, 2^8315231 is an apocalyptic number.

8315231 is a deficient number, since it is larger than the sum of its proper divisors (1).

8315231 is an equidigital number, since it uses as much as digits as its factorization.

8315231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 8315231 is about 2883.6142252389. The cubic root of 8315231 is about 202.5931573612.

The spelling of 8315231 in words is "eight million, three hundred fifteen thousand, two hundred thirty-one".