2206651 has 4 divisors (see below), whose sum is σ = 2336472. Its totient is φ = 2076832.

The previous prime is 2206649. The next prime is 2206657. The reversal of 2206651 is 1566022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1566022 = 2 ⋅783011.

It is a cyclic number.

It is not a de Polignac number, because 2206651 - 2¹ = 2206649 is a prime.

It is a Duffinian number.

2206651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2206657) 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 3 ways as a sum of consecutive naturals, for example, 64885 + ... + 64918.

It is an arithmetic number, because the mean of its divisors is an integer number (584118).

2^2206651 is an apocalyptic number.

2206651 is the 940-th centered pentagonal number.

2206651 is a deficient number, since it is larger than the sum of its proper divisors (129821).

2206651 is a wasteful number, since it uses less digits than its factorization.

2206651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129820.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2206651 is about 1485.4800570859. The cubic root of 2206651 is about 130.1900769768.

The spelling of 2206651 in words is "two million, two hundred six thousand, six hundred fifty-one".