2631605 has 8 divisors (see below), whose sum is σ = 3267000. Its totient is φ = 2032576.

The previous prime is 2631581. The next prime is 2631631. The reversal of 2631605 is 5061362.

2631605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 128881 + 2502724 = 359^2 + 1582^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2631605 - 2¹² = 2627509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8930 + ... + 9219.

It is an arithmetic number, because the mean of its divisors is an integer number (408375).

2^2631605 is an apocalyptic number.

It is an amenable number.

2631605 is a deficient number, since it is larger than the sum of its proper divisors (635395).

2631605 is a wasteful number, since it uses less digits than its factorization.

2631605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18183.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2631605 is about 1622.2222412481. Note that the first 4 decimals coincide. The cubic root of 2631605 is about 138.0618115593.

Adding to 2631605 its reverse (5061362), we get a palindrome (7692967).

The spelling of 2631605 in words is "two million, six hundred thirty-one thousand, six hundred five".