2621691005 has 8 divisors (see below), whose sum is σ = 3146691672. Its totient is φ = 2096911168.

The previous prime is 2621690993. The next prime is 2621691011. The reversal of 2621691005 is 5001961262.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27520516 + 2594170489 = 5246^2 + 50933^2 .

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 2621691005 - 2¹⁸ = 2621428861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 27854 + ... + 77583.

It is an arithmetic number, because the mean of its divisors is an integer number (393336459).

Almost surely, 2^2621691005 is an apocalyptic number.

It is an amenable number.

2621691005 is a deficient number, since it is larger than the sum of its proper divisors (525000667).

2621691005 is a wasteful number, since it uses less digits than its factorization.

2621691005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110415.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 2621691005 is about 51202.4511620293. The cubic root of 2621691005 is about 1378.8822085068.

The spelling of 2621691005 in words is "two billion, six hundred twenty-one million, six hundred ninety-one thousand, five".