2100609 has 12 divisors (see below), whose sum is σ = 3467776. Its totient is φ = 1200312.

The previous prime is 2100607. The next prime is 2100629. The reversal of 2100609 is 9060012.

It is not a de Polignac number, because 2100609 - 2¹ = 2100607 is a prime.

It is a Duffinian number.

2100609 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2100591 and 2100600.

It is not an unprimeable number, because it can be changed into a prime (2100607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16609 + ... + 16734.

2^2100609 is an apocalyptic number.

It is an amenable number.

2100609 is a deficient number, since it is larger than the sum of its proper divisors (1367167).

2100609 is a wasteful number, since it uses less digits than its factorization.

2100609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33356 (or 33353 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2100609 is about 1449.3477843499. The cubic root of 2100609 is about 128.0702942342.

It can be divided in two parts, 210060 and 9, that multiplied together give a triangular number (1890540 = T₁₉₄₄).

The spelling of 2100609 in words is "two million, one hundred thousand, six hundred nine".