316031231 has 2 divisors, whose sum is σ = 316031232. Its totient is φ = 316031230.

The previous prime is 316031227. The next prime is 316031251. The reversal of 316031231 is 132130613.

It is a happy number.

It is an a-pointer prime, because the next prime (316031251) can be obtained adding 316031231 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 316031231 - 2² = 316031227 is a prime.

It is a super-2 number, since 2×316031231² = 199751477934750722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316031251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158015615 + 158015616.

It is an arithmetic number, because the mean of its divisors is an integer number (158015616).

Almost surely, 2^316031231 is an apocalyptic number.

316031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

316031231 is an equidigital number, since it uses as much as digits as its factorization.

316031231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 316031231 is about 17777.2672534335. The cubic root of 316031231 is about 681.1508991889.

Adding to 316031231 its reverse (132130613), we get a palindrome (448161844).

The spelling of 316031231 in words is "three hundred sixteen million, thirty-one thousand, two hundred thirty-one".