2656651 has 4 divisors (see below), whose sum is σ = 2660904. Its totient is φ = 2652400.

The previous prime is 2656649. The next prime is 2656663. The reversal of 2656651 is 1566562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2656651 - 2¹ = 2656649 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656601) 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, 985 + ... + 2506.

It is an arithmetic number, because the mean of its divisors is an integer number (665226).

2^2656651 is an apocalyptic number.

2656651 is a deficient number, since it is larger than the sum of its proper divisors (4253).

2656651 is an equidigital number, since it uses as much as digits as its factorization.

2656651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252.

The product of its digits is 10800, while the sum is 31.

The square root of 2656651 is about 1629.9236178423. The cubic root of 2656651 is about 138.4984251755.

The spelling of 2656651 in words is "two million, six hundred fifty-six thousand, six hundred fifty-one".