1662559 has 2 divisors, whose sum is σ = 1662560. Its totient is φ = 1662558.

The previous prime is 1662553. The next prime is 1662571. The reversal of 1662559 is 9552661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1662559 - 2⁵ = 1662527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831279 + 831280.

It is an arithmetic number, because the mean of its divisors is an integer number (831280).

2^1662559 is an apocalyptic number.

1662559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662559 is an equidigital number, since it uses as much as digits as its factorization.

1662559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 1662559 is about 1289.4025748384. The cubic root of 1662559 is about 118.4656264726.

The spelling of 1662559 in words is "one million, six hundred sixty-two thousand, five hundred fifty-nine".