1661012 has 6 divisors (see below), whose sum is σ = 2906778. Its totient is φ = 830504.

The previous prime is 1661003. The next prime is 1661021. The reversal of 1661012 is 2101661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1661003) and next prime (1661021).

It can be written as a sum of positive squares in only one way, i.e., 948676 + 712336 = 974^2 + 844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207623 + ... + 207630.

It is an arithmetic number, because the mean of its divisors is an integer number (484463).

2^1661012 is an apocalyptic number.

It is an amenable number.

1661012 is a deficient number, since it is larger than the sum of its proper divisors (1245766).

1661012 is a wasteful number, since it uses less digits than its factorization.

1661012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415257 (or 415255 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1661012 is about 1288.8025450006. The cubic root of 1661012 is about 118.4288712464.

Adding to 1661012 its reverse (2101661), we get a palindrome (3762673).

The spelling of 1661012 in words is "one million, six hundred sixty-one thousand, twelve".