1661361 has 16 divisors (see below), whose sum is σ = 2446080. Its totient is φ = 996480.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661361 is 1631661.

It is not a de Polignac number, because 1661361 - 2³ = 1661353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1080 + ... + 2118.

It is an arithmetic number, because the mean of its divisors is an integer number (152880).

2^1661361 is an apocalyptic number.

It is an amenable number.

1661361 is a deficient number, since it is larger than the sum of its proper divisors (784719).

1661361 is a wasteful number, since it uses less digits than its factorization.

1661361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its digits is 648, while the sum is 24.

The square root of 1661361 is about 1288.9379348906. The cubic root of 1661361 is about 118.4371651422.

The spelling of 1661361 in words is "one million, six hundred sixty-one thousand, three hundred sixty-one".