2171231 has 2 divisors, whose sum is σ = 2171232. Its totient is φ = 2171230.

The previous prime is 2171219. The next prime is 2171243. The reversal of 2171231 is 1321712.

It is a balanced prime because it is at equal distance from previous prime (2171219) and next prime (2171243).

It is a cyclic number.

It is not a de Polignac number, because 2171231 - 2¹⁸ = 1909087 is a prime.

It is a super-2 number, since 2×2171231² = 9428488110722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085615 + 1085616.

It is an arithmetic number, because the mean of its divisors is an integer number (1085616).

2^2171231 is an apocalyptic number.

2171231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171231 is an equidigital number, since it uses as much as digits as its factorization.

2171231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 17.

The square root of 2171231 is about 1473.5097556515. The cubic root of 2171231 is about 129.4897354754.

Adding to 2171231 its reverse (1321712), we get a palindrome (3492943).

It can be divided in two parts, 2171 and 231, that multiplied together give a triangular number (501501 = T₁₀₀₁).

The spelling of 2171231 in words is "two million, one hundred seventy-one thousand, two hundred thirty-one".