1661059 has 2 divisors, whose sum is σ = 1661060. Its totient is φ = 1661058.

The previous prime is 1661029. The next prime is 1661063. The reversal of 1661059 is 9501661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661059 - 2¹¹ = 1659011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1661029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830529 + 830530.

It is an arithmetic number, because the mean of its divisors is an integer number (830530).

2^1661059 is an apocalyptic number.

1661059 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661059 is an equidigital number, since it uses as much as digits as its factorization.

1661059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1661059 is about 1288.8207788517. The cubic root of 1661059 is about 118.4299882571.

It can be divided in two parts, 166 and 1059, that added together give a triangular number (1225 = T₄₉).

The spelling of 1661059 in words is "one million, six hundred sixty-one thousand, fifty-nine".