1996651 has 4 divisors (see below), whose sum is σ = 2005600. Its totient is φ = 1987704.

The previous prime is 1996649. The next prime is 1996681. The reversal of 1996651 is 1566991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1566991 = 643 ⋅2437.

It is a cyclic number.

It is not a de Polignac number, because 1996651 - 2¹ = 1996649 is a prime.

It is a Duffinian number.

1996651 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1996651.

It is not an unprimeable number, because it can be changed into a prime (1996681) 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, 4131 + ... + 4588.

It is an arithmetic number, because the mean of its divisors is an integer number (501400).

2^1996651 is an apocalyptic number.

1996651 is a deficient number, since it is larger than the sum of its proper divisors (8949).

1996651 is an equidigital number, since it uses as much as digits as its factorization.

1996651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8948.

The product of its digits is 14580, while the sum is 37.

The square root of 1996651 is about 1413.0290159795. The cubic root of 1996651 is about 125.9217411068.

The spelling of 1996651 in words is "one million, nine hundred ninety-six thousand, six hundred fifty-one".