1660411 has 2 divisors, whose sum is σ = 1660412. Its totient is φ = 1660410.

The previous prime is 1660409. The next prime is 1660423. The reversal of 1660411 is 1140661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660411 - 2¹ = 1660409 is a prime.

Together with 1660409, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1660471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830205 + 830206.

It is an arithmetic number, because the mean of its divisors is an integer number (830206).

2^1660411 is an apocalyptic number.

1660411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660411 is an equidigital number, since it uses as much as digits as its factorization.

1660411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1660411 is about 1288.5693617342. The cubic root of 1660411 is about 118.4145859115.

The spelling of 1660411 in words is "one million, six hundred sixty thousand, four hundred eleven".