1661061 has 4 divisors (see below), whose sum is σ = 2214752. Its totient is φ = 1107372.

The previous prime is 1661059. The next prime is 1661063. The reversal of 1661061 is 1601661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1601661 = 3 ⋅533887.

It is an interprime number because it is at equal distance from previous prime (1661059) and next prime (1661063).

It is not a de Polignac number, because 1661061 - 2¹ = 1661059 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276841 + ... + 276846.

It is an arithmetic number, because the mean of its divisors is an integer number (553688).

2^1661061 is an apocalyptic number.

It is an amenable number.

1661061 is a deficient number, since it is larger than the sum of its proper divisors (553691).

1661061 is an equidigital number, since it uses as much as digits as its factorization.

1661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553690.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1661061 is about 1288.8215547546. The cubic root of 1661061 is about 118.4300357890.

The spelling of 1661061 in words is "one million, six hundred sixty-one thousand, sixty-one".