2621609 has 4 divisors (see below), whose sum is σ = 2735616. Its totient is φ = 2507604.

The previous prime is 2621603. The next prime is 2621611. The reversal of 2621609 is 9061262.

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 a cyclic number.

It is not a de Polignac number, because 2621609 - 2¹² = 2617513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621603) 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, 56969 + ... + 57014.

It is an arithmetic number, because the mean of its divisors is an integer number (683904).

2^2621609 is an apocalyptic number.

It is an amenable number.

2621609 is a deficient number, since it is larger than the sum of its proper divisors (114007).

2621609 is a wasteful number, since it uses less digits than its factorization.

2621609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114006.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2621609 is about 1619.1383510991. The cubic root of 2621609 is about 137.8867831474.

The spelling of 2621609 in words is "two million, six hundred twenty-one thousand, six hundred nine".