2918231 has 2 divisors, whose sum is σ = 2918232. Its totient is φ = 2918230.

The previous prime is 2918213. The next prime is 2918239. The reversal of 2918231 is 1328192.

Together with previous prime (2918213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2918231 is a prime.

It is a super-2 number, since 2×2918231² = 17032144338722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2918231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2918239) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1459115 + 1459116.

It is an arithmetic number, because the mean of its divisors is an integer number (1459116).

2^2918231 is an apocalyptic number.

2918231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2918231 is an equidigital number, since it uses as much as digits as its factorization.

2918231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 2918231 is about 1708.2830561707. The cubic root of 2918231 is about 142.9025204893.

The spelling of 2918231 in words is "two million, nine hundred eighteen thousand, two hundred thirty-one".