840271231 has 2 divisors, whose sum is σ = 840271232. Its totient is φ = 840271230.

The previous prime is 840271199. The next prime is 840271249. The reversal of 840271231 is 132172048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840271231 - 2⁵ = 840271199 is a prime.

It is a super-2 number, since 2×840271231² = 1412111483292510722, 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 840271231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840271931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420135615 + 420135616.

It is an arithmetic number, because the mean of its divisors is an integer number (420135616).

Almost surely, 2^840271231 is an apocalyptic number.

840271231 is a deficient number, since it is larger than the sum of its proper divisors (1).

840271231 is an equidigital number, since it uses as much as digits as its factorization.

840271231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 840271231 is about 28987.4322940132. The cubic root of 840271231 is about 943.6403394885.

It can be divided in two parts, 84027 and 1231, that added together give a palindrome (85258).

The spelling of 840271231 in words is "eight hundred forty million, two hundred seventy-one thousand, two hundred thirty-one".