1642231 has 2 divisors, whose sum is σ = 1642232. Its totient is φ = 1642230.

The previous prime is 1642211. The next prime is 1642243. The reversal of 1642231 is 1322461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1642231 - 2¹¹ = 1640183 is a prime.

It is a super-2 number, since 2×1642231² = 5393845314722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1642199 and 1642208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821115 + 821116.

It is an arithmetic number, because the mean of its divisors is an integer number (821116).

2^1642231 is an apocalyptic number.

1642231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642231 is an equidigital number, since it uses as much as digits as its factorization.

1642231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 1642231 is about 1281.4956106050. The cubic root of 1642231 is about 117.9808213588.

Adding to 1642231 its reverse (1322461), we get a palindrome (2964692).

The spelling of 1642231 in words is "one million, six hundred forty-two thousand, two hundred thirty-one".