1996551 has 12 divisors (see below), whose sum is σ = 2914912. Its totient is φ = 1316736.

The previous prime is 1996549. The next prime is 1996559. The reversal of 1996551 is 1556991.

1996551 is a `hidden beast` number, since 19 + 96 + 551 = 666.

It is not a de Polignac number, because 1996551 - 2¹ = 1996549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1996559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271 + ... + 2016.

2^1996551 is an apocalyptic number.

1996551 is a deficient number, since it is larger than the sum of its proper divisors (918361).

1996551 is a wasteful number, since it uses less digits than its factorization.

1996551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390 (or 2387 counting only the distinct ones).

The product of its digits is 12150, while the sum is 36.

The square root of 1996551 is about 1412.9936305589. The cubic root of 1996551 is about 125.9196388559.

The spelling of 1996551 in words is "one million, nine hundred ninety-six thousand, five hundred fifty-one".