1661013 has 8 divisors (see below), whose sum is σ = 2460800. Its totient is φ = 1107324.

The previous prime is 1661003. The next prime is 1661021. The reversal of 1661013 is 3101661.

1661013 is a `hidden beast` number, since 1 + 661 + 0 + 1 + 3 = 666.

It is not a de Polignac number, because 1661013 - 2¹² = 1656917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30733 + ... + 30786.

It is an arithmetic number, because the mean of its divisors is an integer number (307600).

2^1661013 is an apocalyptic number.

It is an amenable number.

1661013 is a deficient number, since it is larger than the sum of its proper divisors (799787).

1661013 is an equidigital number, since it uses as much as digits as its factorization.

1661013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61528 (or 61522 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1661013 is about 1288.8029329576. The cubic root of 1661013 is about 118.4288950128.

Adding to 1661013 its reverse (3101661), we get a palindrome (4762674).

The spelling of 1661013 in words is "one million, six hundred sixty-one thousand, thirteen".