2102649 has 4 divisors (see below), whose sum is σ = 2803536. Its totient is φ = 1401764.

The previous prime is 2102647. The next prime is 2102651. The reversal of 2102649 is 9462012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2102647) and next prime (2102651).

It is a cyclic number.

It is not a de Polignac number, because 2102649 - 2¹ = 2102647 is a prime.

It is a super-2 number, since 2×2102649² = 8842265634402, which contains 22 as substring.

It is a D-number.

2102649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2102647) 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, 350439 + ... + 350444.

It is an arithmetic number, because the mean of its divisors is an integer number (700884).

2^2102649 is an apocalyptic number.

It is an amenable number.

2102649 is a deficient number, since it is larger than the sum of its proper divisors (700887).

2102649 is an equidigital number, since it uses as much as digits as its factorization.

2102649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700886.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2102649 is about 1450.0513784001. The cubic root of 2102649 is about 128.1117391788. Note that the first 3 decimals are identical.

The spelling of 2102649 in words is "two million, one hundred two thousand, six hundred forty-nine".