2158231 has 2 divisors, whose sum is σ = 2158232. Its totient is φ = 2158230.

The previous prime is 2158223. The next prime is 2158237. The reversal of 2158231 is 1328512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2158231 - 2³ = 2158223 is a prime.

It is a super-2 number, since 2×2158231² = 9315922098722, which contains 22 as substring.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079115 + 1079116.

It is an arithmetic number, because the mean of its divisors is an integer number (1079116).

2^2158231 is an apocalyptic number.

2158231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158231 is an equidigital number, since it uses as much as digits as its factorization.

2158231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 2158231 is about 1469.0918963768. The cubic root of 2158231 is about 129.2307829216.

The spelling of 2158231 in words is "two million, one hundred fifty-eight thousand, two hundred thirty-one".