1668131 has 2 divisors, whose sum is σ = 1668132. Its totient is φ = 1668130.

The previous prime is 1668119. The next prime is 1668133. The reversal of 1668131 is 1318661.

It is a strong prime.

It is an emirp because it is prime and its reverse (1318661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1668131 - 2¹⁴ = 1651747 is a prime.

It is a super-2 number, since 2×1668131² = 5565322066322, which contains 22 as substring.

Together with 1668133, it forms a pair of twin primes.

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 1668131.

It is not a weakly prime, because it can be changed into another prime (1668133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834065 + 834066.

It is an arithmetic number, because the mean of its divisors is an integer number (834066).

2^1668131 is an apocalyptic number.

1668131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668131 is an equidigital number, since it uses as much as digits as its factorization.

1668131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 1668131 is about 1291.5614580809. The cubic root of 1668131 is about 118.5978231682.

The spelling of 1668131 in words is "one million, six hundred sixty-eight thousand, one hundred thirty-one".