1642206231 has 10 divisors (see below), whose sum is σ = 2453172392. Its totient is φ = 1094804100.

The previous prime is 1642206227. The next prime is 1642206289. The reversal of 1642206231 is 1326022461.

1642206231 is a `hidden beast` number, since 1 + 6 + 422 + 0 + 6 + 231 = 666.

It is not a de Polignac number, because 1642206231 - 2² = 1642206227 is a prime.

It is a super-2 number, since 2×1642206231² = 5393682610270450722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642206195 and 1642206204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642206031) by changing a digit.

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

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10136995 + ... + 10137156.

Almost surely, 2^1642206231 is an apocalyptic number.

1642206231 is a deficient number, since it is larger than the sum of its proper divisors (810966161).

1642206231 is an equidigital number, since it uses as much as digits as its factorization.

1642206231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20274163 (or 20274154 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1642206231 is about 40524.1438034167. The cubic root of 1642206231 is about 1179.8022820599.

Adding to 1642206231 its reverse (1326022461), we get a palindrome (2968228692).

The spelling of 1642206231 in words is "one billion, six hundred forty-two million, two hundred six thousand, two hundred thirty-one".