1659491 has 2 divisors, whose sum is σ = 1659492. Its totient is φ = 1659490.

The previous prime is 1659457. The next prime is 1659527. The reversal of 1659491 is 1949561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1659491 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1659401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829745 + 829746.

It is an arithmetic number, because the mean of its divisors is an integer number (829746).

2^1659491 is an apocalyptic number.

1659491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659491 is an equidigital number, since it uses as much as digits as its factorization.

1659491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 1659491 is about 1288.2123272194. The cubic root of 1659491 is about 118.3927114989.

The spelling of 1659491 in words is "one million, six hundred fifty-nine thousand, four hundred ninety-one".