2606409821 has 8 divisors (see below), whose sum is σ = 2617517784. Its totient is φ = 2595320640.

The previous prime is 2606409809. The next prime is 2606409823. The reversal of 2606409821 is 1289046062.

It can be written as a sum of positive squares in 4 ways, for example, as 236083225 + 2370326596 = 15365^2 + 48686^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2606409821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2606409823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319631 + ... + 327683.

It is an arithmetic number, because the mean of its divisors is an integer number (327189723).

Almost surely, 2^2606409821 is an apocalyptic number.

It is an amenable number.

2606409821 is a deficient number, since it is larger than the sum of its proper divisors (11107963).

2606409821 is a wasteful number, since it uses less digits than its factorization.

2606409821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9391.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 2606409821 is about 51053.0099112677. The cubic root of 2606409821 is about 1376.1979327346.

The spelling of 2606409821 in words is "two billion, six hundred six million, four hundred nine thousand, eight hundred twenty-one".