1660231 has 2 divisors, whose sum is σ = 1660232. Its totient is φ = 1660230.

The previous prime is 1660229. The next prime is 1660247. The reversal of 1660231 is 1320661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660231 - 2¹ = 1660229 is a prime.

It is a super-2 number, since 2×1660231² = 5512733946722, which contains 22 as substring.

Together with 1660229, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1660199 and 1660208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830115 + 830116.

It is an arithmetic number, because the mean of its divisors is an integer number (830116).

2^1660231 is an apocalyptic number.

1660231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660231 is an equidigital number, since it uses as much as digits as its factorization.

1660231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1660231 is about 1288.4995149398. The cubic root of 1660231 is about 118.4103067711.

Adding to 1660231 its reverse (1320661), we get a palindrome (2980892).

It can be divided in two parts, 1660 and 231, that added together give a triangular number (1891 = T₆₁).

The spelling of 1660231 in words is "one million, six hundred sixty thousand, two hundred thirty-one".